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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Freight revenue $ 159,500 $ 148,229 $ 445,212 $ 437,344
Fuel surcharge revenue 19,131 16,271 56,489 42,329
Total revenue 178,631 164,500 501,701 479,673
Operating expenses:        
Salaries, wages, and related expenses 60,732 57,972 178,639 171,666
Fuel expense 25,998 26,436 76,310 75,989
Operations and maintenance 13,046 11,359 37,504 34,227
Revenue equipment rentals and purchased transportation 36,361 27,831 90,719 80,308
Operating taxes and licenses 2,364 2,815 7,197 8,404
Insurance and claims 7,681 8,362 24,313 21,985
Communications and utilities 1,747 1,546 5,081 4,488
General supplies and expenses 3,729 3,405 10,919 10,193
Depreciation and amortization, including gains and losses on disposition of property and equipment 17,932 19,328 57,707 52,232
Total operating expenses 169,590 159,054 488,389 459,492
Operating income 9,041 5,446 13,312 20,181
Interest expense, net 2,174 1,959 6,216 6,210
Income from equity method investment (750) (450) (2,575) (2,450)
Income before income taxes 7,617 3,937 9,671 16,421
Income tax expense 2,985 1,068 3,530 5,568
Net income $ 4,632 $ 2,869 $ 6,141 $ 10,853
Income per share:        
Basic net income per share (in dollars per share) $ 0.25 $ 0.16 $ 0.34 $ 0.60
Diluted net income per share (in dollars per share) $ 0.25 $ 0.16 $ 0.33 $ 0.59
Basic weighted average shares outstanding (in shares) 18,288 18,194 18,275 18,177
Diluted weighted average shares outstanding (in shares) 18,404 18,287 18,366 18,258