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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues      
Freight revenue $ 640,120 $ 578,204 $ 538,933
Fuel surcharge revenue 84,120 140,776 145,616
Total revenue 724,240 718,980 684,549
Operating expenses:      
Salaries, wages, and related expenses 244,779 231,761 218,946
Fuel expense 122,160 168,856 186,002
Operations and maintenance 46,458 47,251 50,043
Revenue equipment rentals and purchased transportation 118,583 111,772 102,954
Operating taxes and licenses 11,016 10,960 10,969
Insurance and claims 31,909 39,594 30,305
Communications and utilities 6,162 5,806 5,240
General supplies and expenses 14,007 16,950 16,002
Depreciation and amortization, including gains and losses on disposition of equipment 61,384 46,384 43,694
Total operating expenses 656,458 679,334 664,155
Operating income 67,782 39,646 20,394
Other expenses (income):      
Interest expense $ 8,445 10,807 10,400
Other (13) (3)
Other expenses, net $ 8,445 10,794 10,397
Equity in income of affiliate 4,570 3,730 2,750
Income before income taxes 63,907 32,582 12,747
Income tax expense 21,822 14,774 7,503
Net income $ 42,085 $ 17,808 $ 5,244
Income per share:      
Basic income per share: (in dollars per share) $ 2.32 $ 1.17 $ 0.35
Diluted income per share: (in dollars per share) $ 2.30 $ 1.15 $ 0.35
Basic weighted average shares outstanding (in shares) 18,145 15,250 14,837
Diluted weighted average shares outstanding (in shares) 18,311 15,517 15,039