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Condensed Consolidated Statements of Earnings (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Operating revenues, excluding fuel surcharge revenues $ 1,483,354 $ 1,360,631 $ 2,910,008 $ 2,624,541
Fuel surcharge revenues 131,672 179,326 233,730 355,596
Total operating revenues 1,615,026 1,539,957 3,143,738 2,980,137
Operating expenses:        
Rents and purchased transportation 794,907 730,851 1,535,310 1,424,535
Salaries, wages and employee benefits 371,969 348,277 734,480 678,786
Depreciation and amortization 90,364 83,661 178,716 165,038
Fuel and fuel taxes 71,489 84,891 130,903 166,704
Operating supplies and expenses 56,495 56,718 111,031 107,199
General and administrative expenses, net of asset dispositions 18,711 27,670 40,545 41,606
Insurance and claims 19,094 18,207 36,522 35,635
Operating taxes and licenses 11,365 10,734 22,491 20,822
Communication and utilities 4,840 5,213 10,058 10,857
Total operating expenses 1,439,234 1,366,222 2,800,056 2,651,182
Operating income 175,792 173,735 343,682 328,955
Net interest expense 6,420 6,661 12,862 13,364
Earnings before income taxes 169,372 167,074 330,820 315,591
Income taxes 64,361 63,655 125,711 120,240
Net earnings $ 105,011 $ 103,419 $ 205,109 $ 195,351
Weighted average basic shares outstanding (in shares) 112,669 116,470 112,871 116,514
Basic earnings per share (in dollars per share) $ 0.93 $ 0.89 $ 1.82 $ 1.68
Weighted average diluted shares outstanding (in shares) 113,761 117,811 113,882 117,805
Diluted earnings per share (in dollars per share) $ 0.92 $ 0.88 $ 1.80 $ 1.66
Dividends declared per common share (in dollars per share) $ 0.22 $ 0.21 $ 0.44 $ 0.42