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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue:        
Freight revenue $ 153,522 $ 141,917 $ 449,003 $ 405,750
Fuel surcharge revenue 19,990 35,664 67,175 106,442
Total revenue 173,512 177,581 516,178 512,192
Operating expenses:        
Salaries, wages, and related expenses 60,241 57,636 177,624 166,651
Fuel expense 30,526 42,784 94,931 127,875
Operations and maintenance 12,728 11,934 35,666 35,498
Revenue equipment rentals and purchased transportation 27,548 25,871 76,714 78,818
Operating taxes and licenses 2,879 2,733 8,162 8,041
Insurance and claims 6,682 15,545 21,727 29,229
Communications and utilities 1,527 1,457 4,547 4,320
General supplies and expenses 2,060 3,950 9,993 12,289
Depreciation and amortization, including gains and losses on disposition of property and equipment 14,692 10,085 43,368 34,476
Total operating expenses 158,883 171,995 472,732 497,197
Operating income 14,629 5,586 43,446 14,995
Other (income) expenses:        
Interest expense $ 2,041 2,635 $ 5,962 8,108
Interest income (1) (10)
Other expenses, net $ 2,041 2,634 $ 5,962 8,098
Equity in income of affiliate 1,000 880 3,720 2,530
Income before income taxes 13,588 3,832 41,204 9,427
Income tax expense 5,961 1,975 12,349 5,164
Net income $ 7,627 $ 1,857 $ 28,855 $ 4,263
Income per share:        
Basic net income per share (in dollars per share) $ 0.42 $ 0.12 $ 1.59 $ 0.29
Diluted net income per share (in dollars per share) $ 0.42 $ 0.12 $ 1.57 $ 0.28
Basic weighted average shares outstanding (in shares) 18,119 14,959 18,175 14,935
Diluted weighted average shares outstanding (in shares) 18,320 15,145 18,346 15,166