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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
Revenue:        
Freight revenue $ 144,436 $ 152,146 $ 289,115 $ 295,480
Fuel surcharge revenue 14,396 23,305 26,058 47,186
Total revenue 158,832 175,451 315,173 342,666
Operating expenses:        
Salaries, wages, and related expenses 55,940 59,131 113,694 117,384
Fuel expense 25,720 32,511 49,554 64,405
Operations and maintenance 11,707 12,140 22,868 22,937
Revenue equipment rentals and purchased transportation 27,378 25,957 52,477 49,166
Operating taxes and licenses 2,881 2,622 5,589 5,283
Insurance and claims 6,726 4,276 13,622 15,045
Communications and utilities 1,465 1,493 2,942 3,020
General supplies and expenses 3,680 4,252 6,788 7,933
Depreciation and amortization, including gains and losses on disposition of property and equipment 16,019 14,295 32,904 28,677
Total operating expenses 151,516 156,677 300,438 313,850
Operating income 7,316 18,774 14,735 28,816
Other expenses:        
Interest expense 1,955 1,717 4,251 3,920
Other expenses, net 1,955 1,717 4,251 3,920
Equity in income of affiliate 1,150 1,335 2,000 2,720
Income before income taxes 6,511 18,392 12,484 27,616
Income tax expense 2,879 7,391 4,500 6,388
Net income $ 3,632 $ 11,001 $ 7,984 $ 21,228
Income per share:        
Basic net income per share (in dollars per share) $ 0.20 $ 0.60 $ 0.44 $ 1.17
Diluted net income per share (in dollars per share) $ 0.20 $ 0.60 $ 0.44 $ 1.16
Basic weighted average shares outstanding (in shares) 18,189 18,261 18,168 18,204
Diluted weighted average shares outstanding (in shares) 18,275 18,413 18,244 18,361