Item 1. BUSINESS

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Item 1. BUSINESS

W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property casualty insurance business:

•Insurance - commercial insurance business, including excess and surplus lines and admitted lines, throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia; and
•Reinsurance - reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa.

Commencing with the first quarter of 2016, the Company changed the aggregation of its reported segments. Operating units in the Insurance-Domestic segment and Insurance-International segment, previously reported separately, were combined into the Insurance segment. The segment disclosures for prior periods have been revised to be consistent with the new reportable business segment presentation.

Our two reporting segments are composed of individual operating units that serve a market defined by geography, products, services or types of customers. Each of our operating units is positioned close to its customer base and participates in a niche market requiring specialized knowledge about a territory or product. This strategy of decentralized operations allows each of our units to identify and respond quickly and effectively to changing market conditions and local customer needs, while capitalizing on the benefits of centralized capital, investment and reinsurance management, and corporate actuarial, financial, enterprise risk management and legal staff support.

Our business approach is focused on meeting the needs of our customers, maintaining a high quality balance sheet, and allocating capital to our best opportunities. New businesses are started when opportunities are identified and when the right talent and expertise are found to lead a business. Of our 54 operating units, 47 have been organized and developed internally and seven have been added through acquisition.

Net premiums written, as reported based on United States generally accepted accounting principles (“GAAP”), for each of our operating segments for each of the past five years were as follows:

Year Ended December 31,
(In thousands)20162015201420132012
Net premiums written:
Insurance$5,775,913$5,591,397$5,345,663$4,750,572$4,234,342
Reinsurance648,000598,118651,284749,601664,197
Total$6,423,913$6,189,515$5,996,947$5,500,173$4,898,539
Year Ended December 31,
20162015201420132012
Percentage of net premiums written:
Insurance89.9%90.3%89.1%86.4%86.4%
Reinsurance10.19.710.913.613.6
Total100.0%100.0%100.0%100.0%100.0%

Twenty-eight of our twenty-nine insurance company subsidiaries rated by A.M. Best Company, Inc. ("A.M. Best") have ratings of A+ (Superior) (the second highest rating out of 15 possible ratings), and one is rated A (Excellent) (the third highest rating). A.M. Best's ratings are based upon factors of concern to policyholders, insurance agents and brokers and are not directed toward the protection of investors. A.M. Best states: “The Financial Strength Rating opinion addresses the relative ability of an insurer to meet its ongoing insurance obligations. The ratings are not assigned to specific insurance policies or contracts and do not address any other risk.” A.M. Best reviews its ratings on a periodic basis, and its ratings of the Company's subsidiaries are therefore subject to change.

Our twenty-four insurance company subsidiaries rated by Standard & Poor's (“S&P”) have financial strength ratings of A+ (the seventh highest rating out of twenty-seven possible ratings).

Our Moody's ratings are A2 for Berkley Insurance Company, Berkley Regional Insurance Company and Admiral Insurance Company (the sixth highest rating out of twenty-one possible ratings).

The following sections describe our reporting segments and their operating units in greater detail. These operating units underwrite on behalf of one or more affiliated insurance companies within the group. Certain operating units are identified by us herein for descriptive purposes only and are not legal entities. Unless otherwise indicated, all references in this Form 10-K to “W. R. Berkley,” “we,” “us,” “our,” the “Company” or similar terms refer to W. R. Berkley Corporation together with its subsidiaries and operating units. W. R. Berkley Corporation is a Delaware corporation formed in 1970.

Insurance

Our U.S.-based operating units underwrite commercial insurance business primarily throughout the United States, although many units offer coverage globally, focusing on the following general areas:

Excess & Surplus Lines: A number of our operating units are dedicated to the U.S. excess and surplus lines market. They serve a highly diverse group of customers that often have complex risk or unique exposures that typically fall outside the underwriting guidelines of the standard insurance market. Lines of business underwritten by our excess and surplus lines operating units include premises operations, commercial automobile, property, products liability and professional liability lines. Products are generally distributed through wholesale agents and brokers.

Industry Specialty: Certain other operating units focus on providing specialty coverages to customers within a particular industry that are best served by underwriters and claims professionals with specialized knowledge of that industry. They offer multiple lines of business with policies tailored to address these unique exposures, often with the flexibility of providing coverages on either an admitted or a non-admitted basis in the U.S. Each operating unit delivers its products through one or more distribution channels, including retail and wholesale agents, brokers, and managing general agents (MGAs), depending on the customer and the particular risks insured.

Product Specialty: Other operating units specialize in providing specific lines of insurance coverage, such as workers’ compensation or professional liability, to a wide range of customers. They offer insurance products, analytical tools and risk management services such as loss control and claims management that enable clients to manage their risk appropriately. Business is typically written on an admitted basis, although some units may offer non-admitted products in the U.S. and offer products internationally. Independent agents and brokers are the primary means of distribution.

Regional: Certain operating units offer standard insurance products and services focused on meeting the specific needs of a geographically differentiated customer base. Key clients of these units are small-to-midsized businesses. These regionally focused operating units provide a broad array of commercial insurance products to customers primarily in 45 states and the District of Columbia and have developed expertise in niches that reflect local economies. They are organized geographically in order to provide them with the flexibility to adapt quickly to local market conditions and customer needs.

In addition, through our non-U.S. insurance operating units, we write business in more than 60 countries worldwide, with branches or offices in 20 locations outside the United States, including the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia. In each of our operating territories, we have built decentralized structures that allow products and services to be tailored to each regional customer base. Our businesses are managed by teams of professionals with expertise in local markets and knowledge of regional environments.

In addition to providing insurance products, certain operating units also provide a wide variety of fee-based services, including claims, administrative and consulting services.

Operating units comprising the Insurance segment are as follows:

Acadia Insurance is a Northeast regional property casualty underwriter offering a broad portfolio of products exclusively through local independent agents in Connecticut, Maine, Massachusetts, New Hampshire, New York and Vermont. In addition to its general offerings, Acadia has specialized expertise in insuring regional industries such as construction, lumber and fishing.

Admiral Insurance provides excess and surplus lines coverage for commercial risks that generally consist of hard-to- place, specialized risks that involve moderate to high degrees of hazard. Its lines of business include general liability, professional liability, property, and excess and umbrella coverage. Admiral's professional liability and program operations include special coverages for technology, ambulatory surgery centers, chiropractors and concierge physicians. Its products are distributed exclusively by wholesale brokers.

American Mining Insurance Group specializes in mono-line workers’ compensation coverage for mining and mining related industries throughout the United States and for high hazard risks in select states.

Berkley Accident and Health underwrites accident and health insurance and reinsurance products in four primary areas: medical stop loss, managed care, special risk and group captive. It has a diversified product and service portfolio serving a range of clients from small employers, health care organizations, and membership groups to Fortune 500 companies.

Berkley Agribusiness Risk Specialists offers insurance for larger commercial risks across the United States involved in the supply, storage, handling, processing and distribution of commodities related to the agriculture and food industries.

Berkley Alliance Managers specializes in professional liability for the design professional, construction professional and certified public accounting industries. The Berkley Design Professional division specializes in architects, engineers and consultants. In addition to professional liability, the Berkley Construction Professional division provides pollution liability and protective coverages to contractors and owners across all forms of non-environmental construction.

Berkley Aviation offers a wide range of aviation insurance products on a global basis, including coverage for airlines, airplanes, helicopters, miscellaneous general aviation operations, non-owned aircraft, fixed-base operations, control towers, airports and other specialized niche programs. In the U.S., it places its business on an admitted and non-admitted basis nationwide.

Berkley Canada underwrites specialty, casualty and surety lines of business on behalf of the Canadian branch of Berkley Insurance Company. It specializes in commercial casualty and professional liability, and offers a broad portfolio of risk products that include commercial general liability, umbrella, professional liability, directors and officers, commercial property and surety, in addition to niche products for specific industries such as technology, life sciences and travel.

Berkley Custom Insurance focuses on the excess casualty insurance market and offers umbrella liability, pollution liability, excess liability, construction wrap-ups and completed operations coverages to wholesalers, retailers, manufacturers, insurance companies, financial institutions and construction companies.

Berkley Cyber Risk Solutions focuses on insurance and risk management products that respond to the changing cyber security vulnerabilities of organizations around the world. It offers specialty commercial insurance coverages on a worldwide basis to clients of all sizes.

Berkley FinSecure serves the insurance needs of financial institutions, credit unions, mortgage lenders, mortgage servicers and trust managers. It offers a comprehensive range of property, casualty, professional liability, and specialty lines insurance products and loss control services, including financial institution-specific commercial package policies, workers' compensation, umbrella, commercial auto, management liability and crime coverages, and financial institution bonds.

Berkley Fire & Marine offers a broad range of preferred inland marine and related property risks and services to customers throughout the United States, both regionally and nationwide. Products are distributed through independent agents and brokers.

Berkley Global Product Recall Management provides worldwide insurance protection and technical assistance to help clients with the prevention, management and indemnification of product recall and contamination events.

Berkley Healthcare Professional provides customized, comprehensive professional liability solutions for the full spectrum of healthcare providers.

Berkley Latinoamérica is a leading provider of property, casualty, automobile, surety, group life and workers' compensation products and services in its operating territories of Argentina, Brazil, the Caribbean, Colombia, Mexico and Uruguay.

Berkley Life Sciences offers a comprehensive spectrum of property, casualty, and specialty products such as professional and management liability to the life sciences industry on a global basis, including both primary and excess liability coverages. It serves pharmaceutical and biotech companies, medical device companies, dietary supplement companies, medical and research related software developers, contract research and manufacturing organizations, research institutions and organizations, and other related businesses.

Berkley Medical Excess insures healthcare organizations such as hospitals and clinics that retain a portion of their risk exposure through a self-funded mechanism and seek to maximize the effectiveness and efficiency of their excess risk financing program.

Berkley Mid-Atlantic Group provides commercial property casualty coverages to a wide variety of businesses in Delaware, the District of Columbia, Maryland, Ohio, Pennsylvania, and Virginia. Focusing on middle market accounts, it complements its standard writings with specialized products in areas such as construction.

Berkley Net Underwriters focuses on small and medium-sized commercial risks, using a web-based system to allow producers to quote, bind and service workers' compensation insurance products on behalf of W. R. Berkley Corporation member companies. Berkley Net Underwriters also manages W. R. Berkley's assigned risk servicing carrier operations.

Berkley North Pacific provides local underwriting, claims and risk management services from its home office in Seattle, Washington and branch offices in Boise, Idaho, Spokane, Washington and Salt Lake City, Utah. It operates with a select group of agents in Idaho, Montana, Oregon, Utah and Washington to sell and service property and casualty policies for larger middle-market standard businesses and specialty lines, such as construction.

Berkley Offshore Underwriting Managers is a specialist global underwriter of energy and marine risks. Its three divisions provide specialty insurance products in the energy upstream, energy liability and marine sectors.

Berkley Oil & Gas provides property casualty products and risk services to the United States energy sector. Its customer base includes risks of any size that work in the oil patch, including operators, drillers, geophysical contractors, well-servicing contractors, and manufacturers/distributors of oil field products, as well as those in the renewable energy sector.

Berkley One is expected to launch its products in the latter half of 2017 and will offer specialty personal insurance to sophisticated individuals and families, supported by world class risk and claim management.

Berkley Professional Liability specializes in professional liability insurance for publicly-traded and private entities based on a worldwide basis. Its liability coverages include directors and officers, fiduciary, employment practices, and sponsored insurance agents. Berkley Transactional, a division of Berkley Professional Liability, underwrites a full suite of transactional insurance products, including representations and warranties insurance, tax opinion insurance and contingency liability insurance.

Berkley Program Specialists is a program management company offering both admitted and non-admitted insurance support on a nationwide basis for commercial casualty and inland marine program administrators with specialized insurance expertise. Its book is built around blocks of homogeneous business, or programs, allowing for efficient processes, effective oversight of existing programs and sound implementation of new programs.

Berkley Public Entity specializes in providing excess coverage and services to individual governmental and scholastic entities and intergovernmental risk sharing groups. Products include general liability, automobile liability, law enforcement liability, public officials and educator's legal liability, employment practices liability, incidental medical, property and crime.

Berkley Regional Specialty provides excess and surplus lines coverage on a national basis to small to medium-sized insureds with low to moderate insurance risk. Its product lines include general liability, liquor liability and some property and inland marine coverage. It serves a limited distribution channel consisting of select W. R. Berkley Corporation member company agents.

Berkley Risk Administrators provides at-risk and alternative risk insurance program management services for a broad range of groups and individuals including public entity pools, professional associations, captives and self-insured clients. As a third party administrator, it manages workers’ compensation, liability and property claims nationwide.

Berkley Select specializes in underwriting professional liability insurance with a particular emphasis on large law firms, accounting firms and medical institution facilities. Its products are distributed nationwide through a limited number of brokers.

Berkley Southeast offers a wide array of commercial lines products in six southeastern states: Alabama, Georgia, Mississippi, North Carolina, South Carolina and Tennessee.

Berkley Specialty Underwriting Managers has two underwriting divisions. Its entertainment and sports division underwrites property casualty insurance products, both on an admitted and non-admitted basis, for the entertainment industry and sports-related organizations. The environmental division underwrites specialty insurance products for environmental customers such as contractors, consultants and owners of sites and facilities.

Berkley Surety provides a broad array of surety products for contract and commercial surety risks in the U.S. and Canada, including specialty niches such as environmental and secured credit for small contractors, through an independent agency and broker platform across a network of 16 field offices.

Berkley Technology Underwriters provides a broad range of first and third-party insurance programs for technology exposures and technology industries on both a local and global basis.

Carolina Casualty Insurance provides commercial insurance products and services to the transportation industry with an emphasis on intermediate and long-haul trucking and various classes of business and public automobile coverage. It underwrites on an admitted basis in all 50 states and the District of Columbia.

Clermont Specialty Managers provides package insurance programs for high-end cooperative, condominium, and quality rental apartment buildings and upscale restaurants in the New York, New Jersey, Chicago and Washington, D.C. metropolitan markets, as well as other select markets.

Continental Western Group is a midwest regional property and casualty insurance operation based in Des Moines, Iowa, providing underwriting and risk management services to a broad array of regional businesses in thirteen midwest states. In addition to its generalist portfolio, Continental Western offers specialty underwriting solutions for diversified agriculture, construction, light manufacturing, transportation, volunteer fire departments, rural utilities and public entities.

Gemini Transportation is a national provider of excess liability insurance for various domestic surface transportation businesses. It underwrites liability insurance policies for the railroad industry as well as excess liability policies for the trucking, busing and other industries that use rubber-wheeled vehicles for over-the-road use.

Intrepid Direct offers business coverages to franchise restaurants on a direct basis.

Key Risk is a premier provider of workers' compensation insurance and third party administrative services. It focuses on middle market and national accounts in several niches that appreciate expertise and exceptional service. The unit operates three business units; one focused on middle market accounts located primarily in the mid-Atlantic and southeastern United States, one focused on national temporary staffing and United States Longshoreman & Harbor Act (USL&H) specialty programs and one focused on self-insured customers. Its products are distributed by a select group of independent retail agents and wholesale brokers located through the United States.

Lloyd's Syndicate 2791 Participation represents the Company's minority participation in a Lloyd's syndicate that writes a broad range of mainly short-tail classes of business.

Midwest Employers Casualty provides excess workers' compensation insurance products to individual employers, groups and workers' compensation insurance companies across the United States. Its workers' compensation excess of loss products include self-insured excess of loss coverages, large deductible policies and reinsurance. Through its relationship with Berkley Net Underwriters, Midwest Employers Casualty also offers multi-state coverage for group self-insureds. It has developed sophisticated, proprietary analytical tools and risk management services that help its insureds lower their total cost of risk.

Monitor Liability Managers provides executive and professional liability insurance to small to middle-market risks on a nationwide basis. Its primary professional liability products are management liability, employment practices and fiduciary coverages for private companies and nonprofit organizations, and errors and omissions policies for accounting and law firms.

Nautilus Insurance Group insures excess and surplus lines risks for small to medium-sized commercial risks with low to moderate susceptibility to loss. It writes commercial excess and surplus lines business nationwide and admitted lines commercial business in a limited number of states. A substantial portion of Nautilus' business is written through its close, long-standing network of general agents, who are chosen on a highly selective basis.

Preferred Employers Insurance focuses exclusively on workers' compensation products and services for businesses in California. It serves over 12,000 customers covering a broad spectrum of industries throughout the state.

Riverport Insurance Services provides property casualty insurance coverages to human services organizations, including nonprofit and for-profit organizations, public schools and sports and recreational organizations. Riverport also insures special events. Its product offerings include traditional primary coverages and risk purchasing groups, as well as alternative market solutions for clients who wish to retain a larger share of their own risk.

Union Standard offers preferred commercial property and casualty insurance products and services to a wide range of small to medium size commercial entities through independent agents in Arizona, Arkansas, New Mexico, Oklahoma and Texas. Union Standard's strategy is built around relationships and service.

Vela Insurance Services specializes in commercial casualty insurance on an excess and surplus lines basis. Its primary focus is on general liability insurance for construction, manufacturing and general casualty clients as well as products liability and miscellaneous professional liability coverages distributed through wholesale insurance brokers.

Verus Underwriting Managers offers general liability, professional liability and property coverages for small to mid-sized commercial risks in the excess and surplus lines insurance market through a select group of appointed wholesale brokers and agents.

W. R. Berkley Europe is comprised of specialist operating units offering a focused range of insurance products to markets in Continental Europe and Nordic countries.

W. R. Berkley Insurance Asia underwrites specialty commercial insurance coverages to clients in North Asia and Southeast Asia through offices in Hong Kong and Singapore.

W. R. Berkley Insurance Australia underwrites general insurance business in Australia, including professional indemnity insurance for companies of all sizes.

W / R / B Underwriting provides a broad range of leading insurance products to the European marketplace, with a concentration in specialist classes of business including property, professional indemnity, crisis management, aviation, personal accident and asset protection.

The following table sets forth the percentage of gross premiums written by each Insurance operating unit:

Year Ended December 31,
20162015201420132012
Acadia Insurance6.7%6.7%7.1%6.9%7.1%
Admiral Insurance5.54.95.34.95.1
American Mining Insurance Group0.70.80.70.70.7
Berkley Accident and Health4.43.72.92.53.0
Berkley Agribusiness Risk Specialists1.10.90.90.90.9
Berkley Alliance Managers1.50.70.1——
Berkley Aviation1.01.20.80.81.2
Berkley Canada0.80.60.50.70.7
Berkley Custom Insurance2.72.82.42.30.6
Berkley Cyber Risk Solutions—————
Berkley FinSecure0.91.00.70.70.7
Berkley Fire & Marine0.40.30.2——
Berkley Global Product Recall Management0.2————
Berkley Healthcare Professional0.2————
Berkley Latinoamérica4.14.74.65.15.4
Berkley Life Sciences0.80.80.90.90.7
Berkley Medical Excess0.80.90.80.70.7
Berkley Mid-Atlantic Group1.21.82.43.64.0
Berkley Net Underwriters7.94.03.73.42.9
Berkley North Pacific1.51.71.61.51.5
Berkley Offshore Underwriting Managers1.11.41.71.91.8
Berkley Oil & Gas2.73.23.53.22.7
Berkley One—————
Berkley Professional Liability1.51.71.81.11.0
Berkley Program Specialists1.21.21.21.21.5
Berkley Public Entity0.50.40.40.30.2
Berkley Regional Specialty0.30.30.30.30.3
Berkley Risk Administrators0.23.93.94.14.0
Berkley Select1.61.61.82.32.4
Berkley Southeast2.02.32.5——
Berkley Specialty Underwriting Managers6.15.75.35.56.5
Berkley Surety1.21.21.11.11.1
Berkley Technology Underwriters0.60.50.40.30.1
Carolina Casualty Insurance0.61.21.82.01.9
Clermont Specialty Managers1.31.31.31.31.3
Continental Western Group4.04.03.84.04.4
Gemini Transportation1.81.10.90.80.9
Intrepid Direct—————
Key Risk2.62.82.92.82.7
Lloyd's Syndicate 2791 Participation0.50.50.61.01.5
Midwest Employers Casualty2.42.42.52.42.8
Monitor Liability Managers2.32.42.22.62.6
Nautilus Insurance Group4.94.74.64.85.2
Preferred Employers Insurance2.62.42.11.81.6
Riverport Insurances Services0.70.60.60.61.2
Union Standard2.62.62.64.34.4
Vela Insurance Services3.93.33.22.91.8
Verus Underwriting Managers0.90.80.80.80.6
W. R. Berkley Europe1.71.92.42.52.4
W. R. Berkley Insurance Asia—————
W. R. Berkley Insurance Australia1.00.81.31.30.8
W/R/B Underwriting3.95.46.16.06.2
Other0.90.90.81.20.9
Total100.0%100.0%100.0%100.0%100.0%

The following table sets forth percentages of gross premiums written, by line, by our Insurance operations:

Year Ended December 31,
20162015201420132012
Other liability31.3%31.8%31.9%32.4%30.7%
Workers' compensation25.127.927.227.026.8
Short-tail lines (1)23.921.221.822.023.5
Professional liability10.09.48.77.97.8
Commercial auto9.79.710.410.711.2
Total100.0%100.0%100.0%100.0%100.0%

(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

Reinsurance

We provide other insurance companies and self-insureds with assistance in managing their net risk through reinsurance on either a portfolio basis, through treaty reinsurance, or on an individual basis, through facultative reinsurance.

Operating units comprising the Reinsurance segment are as follows:

Berkley Re America provides treaty and facultative reinsurance solutions on a variety of product lines through reinsurance brokers to companies whose primary operations are within the United States and Canada.

Berkley Re Asia Pacific provides property and casualty reinsurance to the Asia Pacific marketplace. With offices in Brisbane, Sydney, Hong Kong and Singapore, each branch focuses on excess of loss reinsurance, targeting both property and casualty treaty and facultative contracts, through multiple distribution channels.

Berkley Re Direct is a direct casualty facultative reinsurance underwriter serving clients through a nationwide network of regional offices. Its facultative reinsurance products include automatic, semi-automatic and individual risk assumed reinsurance. Berkley Re Direct also provides its customers value-added services across its lines, including underwriting, claims and actuarial consultation.

Berkley Re UK writes international property casualty treaty accounts. Its territorial scope includes reinsured clients domiciled in the United Kingdom, Europe, Africa, the Middle East and the Caribbean.

The following table sets forth the percentages of gross premiums written by each Reinsurance operating unit:

Year Ended December 31,
20162015201420132012
Berkley Re America67.6%64.2%60.4%52.2%54.3%
Berkley Re UK11.410.811.29.16.9
Berkley Re Asia Pacific10.616.421.224.922.1
Berkley Re Direct9.78.67.26.56.2
Other0.7——7.310.5
Total100.0%100.0%100.0%100.0%100.0%

The following table sets forth the percentages of gross premiums written by our Reinsurance operations:

Year Ended December 31,
20162015201420132012
Casualty59.7%66.7%66.9%65.6%66.9%
Property40.333.333.134.433.1
Total100.0%100.0%100.0%100.0%100.0%

Results by Segment

Summary financial information about our segments is presented on a GAAP basis in the following table:

Year Ended December 31,
(In thousands)20162015201420132012
Insurance
Revenue$6,205,921$5,938,444$5,665,200$5,064,403$4,622,579
Income before income taxes822,617776,593826,088705,662630,139
Reinsurance
Revenue719,412683,335758,931810,060731,585
Income before income taxes74,79994,852115,677110,425103,690
Other(1)
Revenue728,851584,678704,797534,071469,390
Income (loss) before income taxes(978)(139,415)10,431(117,199)(31,901)
Total
Revenue$7,654,184$7,206,457$7,128,928$6,408,534$5,823,554
Income before income taxes$896,438$732,030$952,196$698,888$701,928

(1)Represents corporate revenues, corporate expenses, net investment gains and losses, and revenues and expenses from non-insurance businesses that are consolidated for financial reporting purposes.

The table below represents summary underwriting ratios on a GAAP basis for our segments. Loss ratio is losses and loss expenses incurred expressed as a percentage of net premiums earned. Expense ratio is underwriting expenses expressed as a percentage of net premiums earned. Underwriting expenses do not include expenses related to insurance services or unallocated corporate expenses. Combined ratio is the sum of the loss ratio and the expense ratio. The combined ratio represents a measure of underwriting profitability, excluding investment income. A number in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit:

Year Ended December 31,
20162015201420132012
Insurance
Loss ratio61.0%60.8%60.6%61.0%62.9%
Expense ratio32.632.632.933.733.7
Combined ratio93.6%93.4%93.5%94.7%96.6%
Reinsurance
Loss ratio61.8%58.4%62.0%62.2%64.3%
Expense ratio38.838.234.034.836.3
Combined ratio100.6%96.6%96.0%97.0%100.6%
Total
Loss ratio61.1%60.5%60.8%61.2%63.1%
Expense ratio33.233.233.033.934.1
Combined ratio94.3%93.7%93.8%95.1%97.2%

Investments

Investment results, before income taxes, were as follows:

Year Ended December 31,
(In thousands)20162015201420132012
Average investments, at cost(1)$16,730,964$15,970,931$15,560,335$14,848,386$14,545,371
Net investment income(1)$564,163$512,645$600,885$544,291$586,763
Percent earned on average investments(1)3.4%3.2%3.9%3.7%4.0%
Net investment gains (2)$267,005$92,324$254,852$121,544$10,465
Change in unrealized investment gains (losses) (3)$371,716$(192,186)$72,889$(399,122)$135,282

(1)Includes investments, cash and cash equivalents, trading accounts receivable from brokers and clearing organizations, trading account securities sold but not yet purchased and unsettled purchases.
(2)Represents realized gains on investments not classified as trading account securities.
(3)Represents the change in unrealized investment gains (losses) for available for sale securities.

For comparison, the following are the coupon returns for the Barclays U.S. Aggregate Bond Index and the dividend returns for the S&P 500® Index:

Year Ended December 31,
20162015201420132012
Barclays U.S. Aggregate Bond Index3.0%3.0%3.2%3.1%3.5%
S&P 500® Index2.42.12.12.42.5

The percentages of the fixed maturity portfolio categorized by contractual maturity, based on fair value, on the dates indicated, are set forth below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay certain obligations.

Year Ended December 31,
20162015201420132012
1 year or less7.9%5.8%7.0%8.0%5.8%
Over 1 year through 5 years39.633.632.430.530.7
Over 5 years through 10 years24.630.529.827.523.4
Over 10 years18.820.320.422.325.5
Mortgage-backed securities9.19.810.411.714.6
Total100.0%100.0%100.0%100.0%100.0%

At December 31, 2016, the fixed maturity portfolio had an effective duration of 3.1 years including cash and cash equivalents.

Loss and Loss Expense Reserves

To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.

In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.

In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among others, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are necessarily based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.

The risk and complexity of estimating loss reserves are greater when economic conditions are uncertain. It is especially difficult to estimate the impact of inflation on loss reserves given the current economic environment and related government actions. Whereas a slowing economy would generally lead to lower inflation or even deflation, increased government spending would generally lead to higher inflation. A change in our assumptions regarding inflation would result in reserve increases or decreases that would be reflected in our earnings in periods in which such assumptions are changed.

Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing the reserves are well tested over time, some of the major assumptions about anticipated loss emergence patterns are subject to unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties, which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Although the loss reserves included in the Company’s financial statements

represent management’s best estimates, setting reserves is inherently uncertain and the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.

The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,907 million and $2,308 million at December 31, 2016 and 2015, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $640 million and $699 million at December 31, 2016 and 2015, respectively. At December 31, 2016, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2016) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2016), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates permitted by the Department of Insurance of the State of Delaware.

To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.

The Company’s net reserves for losses and loss expenses relating to asbestos and environmental claims on policies written before adoption of the absolute exclusion was $31 million at December 31, 2016 and $33 million at December 31, 2015. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.

The table below provides a reconciliation of the beginning of year and end of year property casualty reserves for the indicated years:

(In thousands)201620152014
Net reserves at beginning of year$9,244,872$8,970,641$8,683,797
Net provision for losses and loss expenses:
Claims occurring during the current year (1)3,826,6203,653,5613,495,825
Decrease in estimates for claims occurring in prior years (2)(29,904)(46,713)(75,764)
Loss reserve discount amortization (3)49,08449,42270,506
Total3,845,8003,656,2703,490,567
Net payments for claims:
Current year1,052,452914,637898,944
Prior years2,401,7222,342,3782,216,283
Total3,454,1743,257,0153,115,227
Foreign currency translation(46,233)(125,024)(88,496)
Net reserves at end of year9,590,2659,244,8728,970,641
Ceded reserves at end of year1,606,9301,424,2781,399,060
Gross reserves at end of year$11,197,195$10,669,150$10,369,701
Net change in premiums and losses occurring in prior years:
Decrease in estimates for claims occurring in prior years (2)$29,904$46,713$75,764
Retrospective premium adjustments for claims occurring in prior years (4)29,00016,7309,088
Net favorable premium and reserve development on prior years$58,904$63,443$84,852

(1)Claims occurring during the current year are net of discounts of $18,929,000, $20,357,000 and $21,306,000 in 2016, 2015 and 2014, respectively.
(2)The decrease in estimates for claims occurring in prior years is net of discounts. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $59,175,000 in 2016, $64,971,000 in 2015 and $116,866,000 in 2014.
(3)In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.
(4)For certain retrospectively rated insurance polices and reinsurance agreements, changes in loss and loss expenses for prior years are offset by additional or return premiums.

Also, see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and note 14, Reserves for Losses and Loss Expenses included in our audited consolidated financial statements for further information regarding the decrease in estimates for claims occurring in prior years.

A reconciliation between the reserves as of December 31, 2016 as reported in the accompanying consolidated GAAP financial statements and those reported on the basis of statutory accounting principles (“SAP”) in the Company’s U.S. regulatory filings is as follows:

(In thousands)
Net reserves reported in U.S. regulatory filings on a SAP basis$9,235,211
Reserves for non-U.S. companies570,556
Loss reserve discounting(1)(215,502)
Ceded reserves1,606,930
Gross reserves reported in the consolidated GAAP financial statements$11,197,195

(1) For statutory purposes, the Company discounts its workers’ compensation reinsurance reserves at 2.2% as permitted by the Department of Insurance of the State of Delaware. In its GAAP financial statements, the Company discounts excess workers’ compensation reserves at the risk-free rate and assumed workers’ compensation reserves at the statutory rate.

Reinsurance

We follow a common industry practice of reinsuring a portion of our exposures and paying to reinsurers a portion of the premiums received on the policies that we write. Reinsurance is purchased principally to reduce net liability on individual risks and to protect against catastrophic losses. Although reinsurance does not legally discharge an insurer from its primary liability for the full amount of the policies, it does make the assuming reinsurer contractually liable to the insurer to the extent of the reinsurance coverage. We monitor the financial condition of our reinsurers and attempt to place our coverages only with substantial, financially sound carriers. As a result, generally the reinsurers who reinsure our casualty insurance must have an A.M. Best rating of “A (Excellent)” or better with at least $1 billion in policyholder surplus and the reinsurers who cover our property insurance must have an A.M. Best rating of “A- (Excellent)” or better with at least $1 billion in policyholder surplus.

Regulation

U.S. Regulation

Our U.S. insurance subsidiaries are subject to varying degrees of regulation and supervision in the jurisdictions in which they do business.

Overview. Our domestic insurance subsidiaries are subject to statutes which delegate regulatory, supervisory and administrative powers to state insurance commissioners. This regulation relates to such matters as the standards of solvency which must be met and maintained; the licensing of insurers and their agents; the nature of and limitations on investments; deposits of securities for the benefit of policyholders; approval of certain policy forms and premium rates; periodic examination of the affairs of insurance companies; annual and other reports required to be filed on the financial condition of insurers or for other purposes; establishment and maintenance of reserves for unearned premiums, loss expenses and losses; and requirements regarding numerous other matters. Our property casualty subsidiaries, other than excess and surplus and reinsurance subsidiaries, must generally file all rates with the insurance department of each state in which they operate. Our excess and surplus and reinsurance subsidiaries generally operate free of rate and form regulation.

Holding Company Statutes. In addition to regulatory supervision of our insurance subsidiaries, we are subject to state statutes governing insurance holding company systems. Under the terms of applicable state statutes, any person or entity desiring to purchase more than a specified percentage (commonly 10%) of our outstanding voting securities would be required to obtain prior regulatory approval of the purchase. Typically, such statutes require that we periodically file information with the appropriate state insurance commissioner, including information concerning our capital structure, ownership, financial condition and general business operations.

In addition, we must annually submit to our lead state regulator an “enterprise risk management report” which identifies the activities and circumstances of any affiliated company that might have a material adverse effect on the financial condition of our group or our U.S. licensed insurers.

Several states have also adopted changes to the holding company act that authorize U.S. insurance regulators to lead or participate in the group-wide supervision of certain international insurance groups. International standard setters, such as the International Association of Insurance Supervisors, are developing capital standards for international groups, and U.S. insurance regulators are currently working on U.S. group capital standards for insurance groups. The U.S. group capital calculation is expected to incorporate existing risk-based capital standards. It is unclear how the development of group capital measures will interact with existing capital requirements for insurance companies in the United States and with international capital standards. It is possible that we may be required to hold additional capital as a result of these developments.

Most states have adopted the National Association of Insurance Commissioners's (“NAIC”) Risk Management and Own Risk Solvency Assessment Model Act (the “ORSA Model Act”), which requires an insurance holding company system’s chief risk officer to submit annually to its lead state insurance regulator an Own Risk and Solvency Assessment Summary Report (“ORSA”). The ORSA is a confidential internal assessment of the material and relevant risks associated with an insurer’s current business plan and the sufficiency of capital resources to support those risks. Under ORSA, we are required to:

•regularly, no less than annually, conduct an ORSA to assess the adequacy of our risk management framework, and current and estimated projected future solvency position;
•internally document the process and results of the assessment; and
•provide a confidential high-level ORSA Summary Report annually to the Commissioner of Insurance of the State of Delaware (our lead state commissioner).

The NAIC is working on an Insurance Data Security Model Law, which would require insurers, insurance producers and other entities required to be licensed under state insurance laws to develop and maintain a written information security program, conduct risk assessments, and oversee the data security practices of third-party vendors. In addition, the New York Department of Financial Services has adopted a cybersecurity regulation that would impose significant new regulatory burdens on companies they supervise, including entities doing business in New York and operating or required to operate under a license, registration, certificate, accreditation or similar authorization. The regulation, which will become effective on March 1, 2017, would require any such company to maintain a cybersecurity program meeting certain core functions, adopt a cybersecurity policy and oversee the cybersecurity practices of third-party service providers, among other requirements.

We cannot predict the impact, if any, that these holding company statutes and compliance with the ORSA Model Act or any proposed or future cybersecurity regulations will have on our business, financial condition or results of operations.

Risk Based Capital Requirements. The NAIC utilizes a Risk Based Capital (“RBC”) formula that is designed to measure the adequacy of an insurer's statutory surplus in relation to the risks inherent in its business. The RBC formula develops a risk adjusted target level of adjusted statutory capital by applying certain factors to various asset, premium and reserve items. The NAIC RBC Model Law provides for four incremental levels of regulatory attention for insurers whose surplus is below the calculated RBC target. These levels of attention range in severity from requiring the insurer to submit a plan for corrective action to actually placing the insurer under regulatory control. The RBC of each of our domestic insurance subsidiaries was above any RBC action level as of December 31, 2016.

Insurance Regulatory Information System. The NAIC also has developed a set of 13 financial ratios referred to as the Insurance Regulatory Information System (“IRIS”). On the basis of statutory financial statements filed with state insurance regulators, the NAIC annually calculates these IRIS ratios to assist state insurance regulators in monitoring the financial condition of insurance companies. The NAIC has established an acceptable range for each of the IRIS financial ratios.

Guaranty Funds. Our U.S. insurance subsidiaries are also subject to assessment by state guaranty funds when an insurer in a particular jurisdiction has been judicially declared insolvent and the insolvent company's available funds are insufficient to pay policyholders and claimants the amounts to which they are entitled. The protection afforded under a state's guaranty fund to policyholders of the insolvent insurer varies from state to state. Generally, all licensed property casualty insurers are considered to be members of the fund, and assessments are based upon their pro rata share of direct written premiums in that state. The NAIC Model Post-Assessment Guaranty Fund Act, which many states have adopted, limits assessments to an insurer to 2% of its subject premium and permits recoupment of assessments through rate setting. Likewise, several states (or underwriting organizations of which our insurance subsidiaries are required to be members) have limited assessment authority with regard to deficits in certain lines of business.

Additionally, state insurance laws and regulations require us to participate in mandatory property-liability “shared market,” “pooling” or similar arrangements that provide certain types of insurance coverage to individuals or others who otherwise are unable to purchase coverage voluntarily provided by private insurers. Shared market mechanisms include assigned risk plans and fair access to insurance requirement or “FAIR” plans. In addition, some states require insurers to participate in reinsurance pools for claims that exceed specified amounts. Our participation in these mandatory shared market or pooling mechanisms generally is related to the amount of our direct writings for the type of coverage written by the specific arrangement in the applicable state.

Dividends. We receive funds from our insurance company subsidiaries in the form of dividends and management fees for certain management services. Annual dividends in excess of maximum amounts prescribed by state statutes may not be paid without the approval of the insurance commissioner of the state in which an insurance subsidiary is domiciled. See “Management's Discussion and Analysis of Financial Condition and Results of Operations-Liquidity and Capital Resources.”

Trade Practices. State insurance laws and regulations include numerous provisions governing trade practices and the marketplace activities of insurers, including provisions governing marketing and sales practices, policyholder services, claims management and complaint handling. State regulatory authorities generally enforce these provisions through periodic market conduct examinations.

Investment Regulation. Investments by our domestic insurance companies must comply with applicable laws and regulations which prescribe the kind, quality and concentration of investments. In general, these laws and regulations permit investments in federal, state and municipal obligations, corporate bonds, preferred and common equity securities, mortgage loans, real estate and certain other investments, subject to specified limits and certain other qualifications. Investments that do not comply with these limits and qualifications are deducted in our insurance subsidiaries' calculation of their statutory capital and surplus.

Terrorism Risk Insurance. The Terrorism Risk Insurance Act of 2002 established a Federal program that provides for a system of shared public and private compensation for insured losses resulting from acts of terrorism. Pursuant to the Terrorism Risk Insurance Program Reauthorization Act of 2015 (“TRIPRA”), the program has been extended for a six year period ending

on December 31, 2020. TRIPRA provides a federal backstop to all U.S. based property and casualty insurers for insurance related losses resulting from any act of terrorism on U.S. soil or against certain U.S. air carriers, vessels or foreign missions. TRIPRA is applicable to almost all commercial lines of property and casualty insurance but excludes commercial auto, burglary and theft, surety, professional liability and farm owners' multi-peril insurance. Insurers with direct commercial property and casualty insurance exposure in the United States are required to participate in the program and make available coverage for certified acts of terrorism. TRIPRA's definition of certified acts includes domestic terrorism. Federal participation will be triggered under TRIPRA when the Secretary of Treasury certifies an act of terrorism. Under the program, the federal government will currently pay 84% of an insurer's covered losses in excess of the insurer's applicable deductible. This amount will decrease to 80% on a pro-rata basis over five years, beginning in 2017. The insurer's deductible is based on 20% of earned premium for the prior year for covered lines of commercial property and casualty insurance. Based on our 2016 earned premiums, our aggregate deductible under TRIPRA during 2017 will be approximately $915 million. The federal program will not pay losses for certified acts unless such losses exceed $140 million industry-wide for calendar year 2017. This threshold will increase to $200 million on a pro-rata basis over five years beginning in 2016. TRIPRA limits the federal government's share of losses at $100 billion for a program year. In addition, an insurer that has satisfied its deductible is not liable for the payment of losses in excess of the $100 billion cap.

Excess and Surplus Lines. The regulation of our U.S. subsidiaries' excess and surplus lines insurance business differs significantly from the regulation of our admitted business. Our surplus lines subsidiaries are subject to the surplus lines regulation and reporting requirements of the jurisdictions in which they are eligible to write surplus lines insurance. Although the surplus lines business is generally less regulated than admitted business, principally with respect to rates and policy forms, strict regulations apply to surplus lines placements in the laws of every state and the regulation of surplus lines insurance may undergo changes in the future. Federal or state measures may be introduced to increase the oversight of surplus lines insurance in the future.

Federal Regulation. Although the federal government and its regulatory agencies generally do not directly regulate the business of insurance, federal initiatives could have an impact on our business in a variety of ways. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”) effected sweeping changes to financial services regulation in the United States. The Dodd-Frank Act created two new federal government bodies, the Federal Insurance Office (the “FIO”) and the Financial Stability Oversight Council (the “FSOC”), which may impact the regulation of insurance. Although the FIO has preemption authority over state insurance laws that conflict with certain international agreements, it does not have general supervisory or regulatory authority over the business of insurance. The FIO has authority to represent the United States in international insurance matters and is authorized to monitor the U.S. insurance industry and identify potential regulatory gaps that could contribute to systemic risk.

The FIO has a particular role in connection with international insurance matters. The FIO represents the U.S. at the International Association of Insurance Supervisors (“IAIS”); in 2016, the FIO participated in IAIS’s Financial Stability Committee and joined IAIS’s Executive Committee. The Dodd-Frank Act authorizes the Secretary of the Treasury and U.S. Trade Representative to enter into international agreements of mutual recognition regarding the prudential regulation of insurance or reinsurance (a “Covered Agreement”). On January 13, 2017, the U.S. Department of Treasury and the U.S. Trade Representative notified the U.S. Congress, as required under the Dodd-Frank Act, that they had successfully negotiated a Covered Agreement with the European Union (“EU”). The Covered Agreement addresses three areas of insurance regulation: reinsurance, group supervision, and the exchange of information between insurance supervisors. The Covered Agreement, if it comes into force, would eliminate reinsurance collateral requirements in the U.S. for a reinsurer domiciled in the EU (and likewise in the EU for a reinsurer domiciled in the U.S.) if such reinsurer meets certain specified minimum criteria. The Covered Agreement would also prevent U.S. states and EU countries from maintaining or adopting any new requirements with substantially the same impact on a reinsurer as the collateral requirements eliminated under the Covered Agreement. "Local presence" requirements for reinsurers from the U.S. or EU operating in the other party's territory would also be eliminated. With respect to group supervision, a U.S. or EU insurance or reinsurance group would be subject to worldwide group supervision (including governance, solvency and capital, and reporting) in the jurisdiction where the ultimate/worldwide parent has its head office or is domiciled. However, if the insurance group also operates in the territory of the other party to the Covered Agreement, then a regulator in a jurisdiction in the other party could exercise authority over an insurance or reinsurance group, but only at the level of the parent holding company located in its jurisdiction and not on a worldwide level, subject to certain exceptions. With respect to the exchange of information between insurance supervisors, the Covered Agreement includes a provision that encourages insurance supervisory authorities in the U.S. and the EU to cooperate in exchanging supervisory information.

Under the Dodd-Frank Act, ninety days following the date it is submitted to the U.S. Congress, the Covered Agreement may enter into force. On the EU side, the European Council and the European Parliament must each adopt decisions approving the Covered Agreement before it can come into force. The Covered Agreement sets out, on a provision-by-provision basis, time frames for implementation. However, there is no guarantee that the Covered Agreement will come into force or that cedants will be willing to accept reduced collateral requirements.

The FIO is required to report to Congress annually on the insurance industry and any preemption actions regarding any Covered Agreement.

On December 12, 2013, the FIO delivered a report to Congress on how to modernize and improve the system of insurance regulation in the U.S. The report recommended that, in the short term, the U.S. system of insurance regulation can be modernized through state-based improvements combined with certain federal actions. The report identified areas for direct federal involvement in international standard setting, the FIO participation in supervisory colleges which monitor the regulation of large national and internationally active insurance groups and federal pursuit of international covered agreements to afford nationally uniform treatment of reinsurance collateral requirements. The report also made several recommendations for state reform of insurance regulation including changes to the state regulation of insurance company solvency, group supervision and corporate governance. The FIO report stated that the system of U.S. insurance regulation can be modernized and improved in the short-term, while warning that if the states do not act in the near term to effectively regulate matters on a consistent and cooperative basis, in the FIO’s view there will be a greater role for federal regulation of insurance.

The FIO also can recommend to the FSOC that it designate an insurer as an entity posing risks to the United States' financial stability in the event of the insurer's material financial distress or failure, i.e., a "systemically important financial institution." An insurer so designated by FSOC will be subject to Federal Reserve supervision and heightened prudential standards. As of December 31, 2016, two insurance groups are subject to this supervision and heightened standards. Based upon our current business model and balance sheet, we do not believe that we will be designated by the FSOC as such an institution. Although the potential impacts of the Dodd-Frank Act on the U. S. insurance industry are not clear, our business could be affected by changes to the U.S. system of insurance regulation or our designation or the designation of insurers or reinsurers with which we do business as systemically important non-bank financial companies.

International Regulation

Our insurance subsidiaries based in the United Kingdom are regulated by the Prudential Regulation Authority ("PRA") and the Financial Conduct Authority ("FCA"). The PRA's primary objectives with regard to insurers are to promote the safety and soundness of insurers and to contribute to the securing of an appropriate degree of protection for current and future policyholders, while the FCA has three operational objectives: (i) to secure an appropriate degree of protection for consumers, (ii) to protect and enhance the integrity of the United Kingdom financial system, and (iii) to promote effective competition in the interests of consumers in the financial services markets. The PRA and FCA employ a variety of regulatory tools to achieve their objectives, including periodic auditing and reporting requirements, risk assessment reviews, minimum solvency margins and individual capital assessment requirements, dividend restrictions, in certain cases, approval requirements governing the appointment of key officers, approval requirements governing controlling ownership interests and various other requirements. Our Lloyd's managing agency is also regulated by the PRA, FCA and Lloyd's, and the Lloyd's syndicate business is subject to Lloyd's supervision. Through Lloyd's, we are licensed to write business in various countries throughout the world by virtue of Lloyd's international licenses. In each such country, we are subject to the laws and insurance regulation of that country. Additionally, PRA and FCA regulations also impact us as “controller” (a PRA/FCA defined term) of our U.K.-regulated subsidiaries, whereby we are required to notify the PRA/FCA about significant events relating to the U.K.-regulated subsidiaries' controllers (i.e. persons or entities which have certain levels of direct or indirect voting power or economic interests in the regulated entities) as well as changes of control, and to submit an annual report regarding their controllers. As well, the PRA/FCA's Senior Insurance Managers Regime provides a regulatory framework for standards of fitness and propriety, conduct and accountability to be applied to individuals in positions of responsibility at insurers. In addition, certain employees are individually registered at Lloyd's.

In the European Union, a new insurance regulatory regime governing, among other things, capital adequacy and risk management called “Solvency II” became effective on January 1, 2016. Lloyd’s applies a capital adequacy test to all Lloyd’s syndicates, including our syndicate, that is based on Solvency II principles. Solvency II provides for the supervision of group solvency. Under Solvency II, it is possible that the U.S. parent of a European Union subsidiary could be subject to certain Solvency II requirements if the U.S. company is not already subject to regulations deemed “equivalent” to Solvency II. Currently, the U.S. system of insurance regulation relating to group supervision is not deemed "equivalent" to Solvency II by European Union authorities. However, we have received a waiver from the PRA, subject to conditions, with respect to the PRA's supervision of our group, which waives the requirement on us to maintain a group solvency capital requirement as calculated under Solvency II rules. The Covered Agreement also prohibits any EU supervisor from exercising group-wide supervision at any level above the highest company organized in the country of that supervisor.

Our international underwriting subsidiaries are also subject to varying degrees of regulation in certain countries in Mexico, Scandinavia, Continental Europe, South America, Australia, Southeast Asia and Canada. Generally, our subsidiaries must satisfy local regulatory requirements. While each country imposes licensing, solvency, auditing and financial reporting requirements, the type and extent of the requirements differ substantially. Key areas where country regulations may differ include: (i) the type of financial reports to be filed; (ii) a requirement to use local intermediaries; (iii) the amount of reinsurance

permissible; (iv) the scope of any regulation of policy forms and rates; and (v) the type and frequency of regulatory examinations.

Competition

The property casualty insurance and reinsurance businesses are highly competitive, with many insurance companies of various sizes, as well as other entities offering risk alternatives such as self-insured retentions or captive programs, transacting business in the United States and internationally. We compete directly with a large number of these companies. Competition in our industry is largely measured by the ability to provide insurance and services at a price and on terms that are reasonable and acceptable to the customer. Our strategy in this highly fragmented industry is to seek specialized areas or geographic regions where our insurance subsidiaries can gain a competitive advantage by responding quickly to changing market conditions. Our subsidiaries establish their own pricing practices based upon a Company-wide philosophy to price products with the intent of making an underwriting profit. Although insurance prices have generally increased for most lines of business since 2011, the rate of increase has declined in more recent years. That decline accelerated in 2016. Loss costs have also increased over that period of time. With the low level of interest rates available, current price levels for certain lines of business remain below the prices required for the Company to achieve its long-term return objectives.

Competition for the Insurance business within the United States comes from other specialty insurers, regional carriers, large national multi-line companies and reinsurers. Our specialty operating units compete with excess and surplus insurers as well as standard carriers. Other regional units compete with mutual and other regional stock companies as well as national carriers. Additionally, direct writers of property casualty insurance compete with our regional units by writing insurance through their salaried employees, generally at a lower acquisition cost than through independent agents such as those used by the Company. Our Insurance operations compete internationally with native insurance operations both large and small, which in some cases are related to government entities, as well as with branches or local subsidiaries of multinational companies.

Competition for the Reinsurance business, which is especially strong, comes from domestic and foreign reinsurers, which produce their business either on a direct basis or through the broker market. These competitors include Swiss Re, Munich Re, Berkshire Hathaway, Transatlantic Reinsurance, Partner Re and others.

In recent years, various institutional investors have increasingly sought to participate in the property and casualty insurance and reinsurance industries. Well-capitalized new entrants to the property and casualty insurance and reinsurance industries, or existing competitors that receive substantial infusions of capital, provide increasing competition, which may adversely impact our business and profitability. Further, an expanded supply of reinsurance capital may lower costs for insurers that rely on reinsurance and, as a consequence, those insurers may be able to price their products more competitively.

Additionally, competition from insurers and reinsurers based in tax-advantaged jurisdictions continues to increase, including from domestic-based subsidiaries of foreign-based entities in the excess and surplus lines businesses.

Employees

As of January 31, 2017, we employed 7,683 individuals. Of this number, our subsidiaries employed 7,536 persons and the remaining persons were employed at the parent company.

Other Information about the Company's Business

We maintain an interest in the acquisition and startup of complementary businesses and continue to evaluate possible acquisitions and new ventures on an ongoing basis. In addition, our insurance subsidiaries develop new coverages or lines of business to meet the needs of insureds.

Seasonal weather variations and other events affect the severity and frequency of losses sustained by the insurance and reinsurance subsidiaries. Although the effect on our business of catastrophes such as tornadoes, hurricanes, hailstorms, earthquakes and terrorist acts may be mitigated by reinsurance, they nevertheless can have a significant impact on the results of any one or more reporting periods.

We have no customer that accounts for 10 percent or more of our consolidated revenues.

Compliance by W. R. Berkley and its subsidiaries with federal, state and local provisions that have been enacted or adopted regulating the discharge of materials into the environment, or otherwise relating to protection of the environment, has not had a material effect upon our capital expenditures, earnings or competitive position.

The Company's internet address is www.wrberkley.com. The information on our website is not incorporated by reference in this annual report on Form 10-K. The Company's annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act and other reports filed by us or with respect to our securities by others are accessible free of charge through this website as soon as reasonably practicable after they have been electronically filed with or furnished to the SEC.

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