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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue:        
Freight revenue $ 145,586 $ 144,436 $ 285,712 $ 289,115
Fuel surcharge revenue 18,740 14,396 37,358 26,058
Total revenue 164,326 158,832 323,070 315,173
Operating expenses:        
Salaries, wages, and related expenses 58,584 55,940 117,908 113,694
Fuel expense 24,911 25,720 50,313 49,554
Operations and maintenance 12,044 11,707 24,457 22,868
Revenue equipment rentals and purchased transportation 28,987 27,378 54,358 52,477
Operating taxes and licenses 2,097 2,881 4,832 5,589
Insurance and claims 7,914 6,726 16,632 13,622
Communications and utilities 1,706 1,465 3,334 2,942
General supplies and expenses 3,462 3,680 7,190 6,788
Depreciation and amortization, including gains and losses on disposition of property and equipment 20,659 16,019 39,775 32,904
Total operating expenses 160,364 151,516 318,799 300,438
Operating income 3,962 7,316 4,271 14,735
Interest expense, net 1,961 1,955 4,041 4,251
Income from equity method investment (800) (1,150) (1,825) (2,000)
Income before income taxes 2,801 6,511 2,055 12,484
Income tax expense 1,253 2,879 545 4,500
Net income $ 1,548 $ 3,632 $ 1,510 $ 7,984
Income per share:        
Basic and diluted net income per share (in dollars per share) $ 0.08 $ 0.20 $ 0.08 $ 0.44
Basic weighted average shares outstanding (in shares) 18,281 18,189 18,269 18,168
Diluted weighted average shares outstanding (in shares) 18,359 18,275 18,347 18,244