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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue:        
Total revenue $ 243,303 $ 178,631 $ 613,187 $ 501,701
Operating expenses:        
Salaries, wages, and related expenses 86,249 60,732 211,621 178,639
Fuel expense 33,428 25,998 89,817 76,310
Operations and maintenance 16,457 13,046 40,783 37,504
Revenue equipment rentals and purchased transportation 47,445 36,361 115,525 90,719
Operating taxes and licenses 3,377 2,364 8,649 7,197
Insurance and claims 12,675 7,681 31,269 24,313
Communications and utilities 1,810 1,747 5,216 5,081
General supplies and expenses 6,391 3,729 16,833 10,919
Depreciation and amortization, including gains and losses on disposition of property and equipment 19,290 17,932 56,803 57,707
Total operating expenses 227,122 169,590 576,516 488,389
Operating income 16,181 9,041 36,671 13,312
Interest expense, net 2,460 2,174 6,360 6,216
Income from equity method investment (2,142) (750) (5,407) (2,575)
Income before income taxes 15,863 7,617 35,718 9,671
Income tax expense 4,249 2,985 9,716 3,530
Net income $ 11,614 $ 4,632 $ 26,002 $ 6,141
Income per share:        
Basic net income per share (in dollars per share) $ 0.63 $ 0.25 $ 1.42 $ 0.34
Diluted net income per share (in dollars per share) $ 0.63 $ 0.25 $ 1.41 $ 0.33
Basic weighted average shares outstanding (in shares) 18,343 18,288 18,337 18,275
Diluted weighted average shares outstanding (in shares) 18,497 18,404 18,448 18,366
Cargo and Freight [Member]        
Revenue:        
Total revenue $ 214,623 $ 159,500 $ 535,721 $ 445,212
Fuel Surcharge [Member]        
Revenue:        
Total revenue $ 28,680 $ 19,131 $ 77,466 $ 56,489