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Condensed Consolidated Statements of Operations (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
Income Statement [Abstract]        
Operating Revenue $ 311,905 $ 323,480 $ 601,816 $ 616,502
Operating Expenses:        
Salaries, wages and employees’ benefits 175,924 170,465 346,190 328,194
Purchased transportation 14,315 20,184 26,782 37,898
Fuel, operating expenses and supplies 59,026 69,165 113,066 136,310
Operating taxes and licenses 10,126 9,411 20,166 18,507
Claims and insurance 10,880 6,361 18,961 11,198
Depreciation and amortization 19,740 16,561 36,983 31,760
Operating losses, net 173 52 363 121
Total operating expenses 290,184 292,199 562,511 563,988
Operating Income 21,721 31,281 39,305 52,514
Nonoperating Expenses (Income):        
Interest expense 1,264 1,074 2,227 2,093
Other, net (36) (14) (43) (65)
Nonoperating expenses, net 1,228 1,060 2,184 2,028
Income Before Income Taxes 20,493 30,221 37,121 50,486
Income Tax Provision 7,218 10,974 13,271 18,634
Net Income $ 13,275 $ 19,247 $ 23,850 $ 31,852
Weighted average common shares outstanding – basic 25,030 24,936 25,014 24,870
Weighted average common shares outstanding – diluted 25,583 25,561 25,560 25,526
Basic Earnings Per Share $ 0.53 $ 0.77 $ 0.95 $ 1.28
Diluted Earnings Per Share $ 0.52 $ 0.75 $ 0.93 $ 1.25