Item 6. Selected Financial Data

The following selected consolidated financial data should be read in conjunction with our consolidated financial statements and related notes, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other financial data included elsewhere in this annual report on Form 10-K. The consolidated statements of income and balance sheet data for all periods presented is derived from the audited consolidated financial statements included elsewhere in this annual report on Form 10-K or in prior year annual reports on Form 10-K on file with the Commission.

The following table sets forth selected financial data for the last five fiscal years (in thousands, except per share data):


Year ended December 31,	2020		2019		2018		2017		2016
Revenue	$	3,198,149	$	2,893,617	$	2,714,474	$	2,489,035	$	2,347,988
Total costs and operating expenses	2,539,615		2,344,699		2,351,975		2,174,746		1,881,478
Income from operations	658,534		548,918		362,499		314,289		466,510
Net income	557,054		478,035		298,373		222,766		320,727
Basic net income per share	3.43		2.94		1.78		1.30		1.83
Diluted net income per share	3.37		2.90		1.76		1.29		1.82
Cash, cash equivalents and marketable securities	2,496,875		2,372,378		2,101,171		1,279,528		1,616,329
Total assets	7,764,130		7,006,886		5,461,770		4,648,916		4,432,190
Convertible senior notes – due 2019	—		—		686,552		662,913		640,087
Convertible senior notes – due 2025	953,066		912,719		874,080		—		—
Convertible senior notes – due 2027	953,641		927,072		—		—		—
Long-term operating lease liabilities	715,404		692,181
Other long-term liabilities	132,553		123,620		185,121		166,840		156,329
Total stockholders’ equity	4,251,296		3,657,958		3,191,860		3,362,469		3,270,218

During the year ended December 31, 2019, we adopted accounting guidance that requires companies to present assets and liabilities arising from leases on the consolidated balance sheet. The guidance was applied prospectively beginning January 1, 2019. Accordingly, assets arising from leases are presented above in total assets in 2020 and 2019 only. In addition, liabilities arising from leases are presented in operating lease liabilities in 2020 and 2019 only.

During the years presented in the table above, various acquisitions occurred, the results of which are presented prospectively from the date of acquisition. These acquisitions may impact the comparability of the consolidated financial data presented above. See Note 8 to our consolidated financial statements included elsewhere in this annual report on Form 10-K for more details regarding these acquisitions.

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