Item 6. SELECTED FINANCIAL DATA



	Year Ended December 31,
(In thousands, except per share amounts
and operating statistics)	2013			2012			2011			2010			2009
Operating Data:
Revenue from operations (1)	$	2,337,648		$	2,134,579		$	1,903,800		$	1,501,848		$	1,260,088
Depreciation and amortization expense (2)	127,072			110,743			90,820			80,362			94,784
Total operating expenses (1)	1,999,210			1,849,325			1,669,728			1,364,109			1,189,697
Operating income	338,438			285,254			234,072			137,739			70,391
Interest expense, net (3)	9,473			11,428			13,887			12,465			12,998
Provision for income taxes	122,573			103,646			80,614			48,775			22,294
Net income	206,113			169,452			139,470			75,651			34,871
Per Share Data:
Diluted earnings per share (4)	2.39			1.97			1.63			0.90			0.42
Balance Sheet Data:
Cash, cash equivalents	30,174			12,857			75,850			5,450			4,171
Current assets	332,979			275,028			331,852			222,582			174,175
Total assets	1,932,089			1,712,514			1,513,074			1,239,881			1,159,278
Current liabilities	232,122			225,139			204,810			170,046			148,125
Long-term debt (including current maturities)	191,429			240,407			269,185			271,217			305,532
Shareholders’ equity	1,232,082			1,025,969			856,519			668,649			593,000
Operating Statistics:
Operating ratio (1)	85.5		%	86.6		%	87.7		%	90.8		%	94.4		%
Revenue per hundredweight (1)	$	15.85		$	15.53		$	14.88		$	13.28		$	12.85
Revenue per intercity mile (1)	$	5.24		$	5.08		$	4.89		$	4.44		$	4.21
Intercity miles (in thousands)	446,532			420,214			389,588			338,504			299,330
Total tons (in thousands)	7,385			6,875			6,397			5,656			4,902
Total shipments (in thousands)	8,279			7,765			7,256			6,327			5,750
Average length of haul (miles)	936			941			952			948			928


(1)	Our prior-period results have been adjusted for an immaterial correction related to how we present the costs of purchased transportation for certain truckload brokerage and international freight forwarding services. For more information on these adjustments, see Note 1 to the Financial Statements included in Item 8, "Financial Statements and Supplementary Data" below.


(2)	Our 2010 results reflect a reduction in depreciation and amortization expense of $12.7 million, which was due to a change in estimate resulting from an evaluation of estimated useful lives and salvage values for our equipment. We determined that useful lives should be extended and salvage values should be reduced for certain equipment effective January 1, 2010.


(3)	For the purpose of this table, interest expense is presented net of interest income.


(4)	Per share data has been restated retroactively for the three-for-two stock splits effected in September 2012 and August 2010.