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Consolidated Statements of Earnings - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating revenues, excluding fuel surcharge revenues $ 6,007,347 $ 5,516,282 $ 5,082,827
Fuel surcharge revenues 548,112 671,364 1,082,614
Total operating revenues 6,555,459 6,187,646 6,165,441
Operating expenses:      
Rents and purchased transportation 3,255,692 2,994,586 3,085,276
Salaries, wages and employee benefits 1,469,187 1,394,239 1,290,404
Depreciation and amortization 361,510 339,613 294,496
Fuel and fuel taxes 283,437 313,034 453,919
Operating supplies and expenses 233,223 220,597 218,539
General and administrative expenses, net of asset dispositions 87,053 72,522 50,596
Insurance and claims 78,410 73,689 81,062
Operating taxes and licenses 45,954 43,084 38,796
Communication and utilities 19,973 20,588 20,811
Total operating expenses 5,834,439 5,471,952 5,533,899
Operating income 721,020 715,694 631,542
Interest income 71 86 87
Interest expense 25,294 25,577 27,028
Earnings before income taxes 695,797 690,203 604,601
Income taxes 263,707 262,968 229,809
Net earnings $ 432,090 $ 427,235 $ 374,792
Weighted average basic shares outstanding (in shares) 112,474 115,677 117,000
Basic earnings per share (in dollars per share) $ 3.84 $ 3.69 $ 3.20
Weighted average diluted shares outstanding (in shares) 113,361 116,728 118,445
Diluted earnings per share (in dollars per share) $ 3.81 $ 3.66 $ 3.16
Dividends declared per common share (in dollars per share) $ 0.88 $ 0.84 $ 0.80