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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Freight revenue $ 140,126 $ 144,679
Fuel surcharge revenue 18,618 11,662
Total revenue 158,744 156,341
Operating expenses:    
Salaries, wages, and related expenses 59,324 57,755
Fuel expense 25,402 23,833
Operations and maintenance 12,413 11,162
Revenue equipment rentals and purchased transportation 25,372 25,098
Operating taxes and licenses 2,735 2,708
Insurance and claims 8,718 6,897
Communications and utilities 1,628 1,477
General supplies and expenses 3,727 3,108
Depreciation and amortization, including gains and losses on disposition of property and equipment 19,116 16,885
Total operating expenses 158,435 148,923
Operating income 309 7,418
Interest expense, net 2,081 2,295
Income from equity method investment (1,025) (850)
(Loss) income before income taxes (747) 5,973
Income tax (benefit) expense (708) 1,621
Net (loss) income $ (39) $ 4,352
Income per share:    
Basic and diluted net (loss) income per share (in dollars per share) $ 0 $ 0.24
Basic weighted average shares outstanding (in shares) 18,256 18,147
Diluted weighted average shares outstanding (in shares) 18,336 18,272