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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues      
Freight revenue $ 610,845 $ 640,120 $ 578,204
Fuel surcharge revenue 59,806 84,120 140,776
Total revenue 670,651 724,240 718,980
Operating expenses:      
Salaries, wages, and related expenses 234,526 244,779 231,761
Fuel expense 103,108 122,160 168,856
Operations and maintenance 45,864 46,458 47,251
Revenue equipment rentals and purchased transportation 117,472 118,583 111,772
Operating taxes and licenses 11,712 11,016 10,960
Insurance and claims 32,596 31,909 39,594
Communications and utilities 6,057 6,162 5,806
General supplies and expenses 14,413 14,007 16,950
Depreciation and amortization, including gains and losses on disposition of equipment 72,456 61,384 46,384
Total operating expenses 638,204 656,458 679,334
Operating income 32,447 67,782 39,646
Interest expense, net 8,226 8,445 10,794
Equity in income of affiliate 3,000 4,570 3,730
Income before income taxes 27,221 63,907 32,582
Income tax expense 10,386 21,822 14,774
Net income $ 16,835 $ 42,085 $ 17,808
Income per share:      
Basic income per share: (in dollars per share) $ 0.93 $ 2.32 $ 1.17
Diluted income per share: (in dollars per share) $ 0.92 $ 2.30 $ 1.15
Basic weighted average shares outstanding (in shares) 18,182 18,145 15,250
Diluted weighted average shares outstanding (in shares) 18,266 18,311 15,517