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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue:        
Freight revenue $ 148,229 $ 153,522 $ 437,344 $ 449,003
Fuel surcharge revenue 16,271 19,990 42,329 67,175
Total revenue 164,500 173,512 479,673 516,178
Operating expenses:        
Salaries, wages, and related expenses 57,972 60,241 171,666 177,624
Fuel expense 26,436 30,526 75,989 94,931
Operations and maintenance 11,359 12,728 34,227 35,666
Revenue equipment rentals and purchased transportation 27,831 27,548 80,308 76,714
Operating taxes and licenses 2,815 2,879 8,404 8,162
Insurance and claims 8,362 6,682 21,985 21,727
Communications and utilities 1,546 1,527 4,488 4,547
General supplies and expenses 3,405 2,060 10,193 9,993
Depreciation and amortization, including gains and losses on disposition of property and equipment 19,328 14,692 52,232 43,368
Total operating expenses 159,054 158,883 459,492 472,732
Operating income 5,446 14,629 20,181 43,446
Other expenses, net 1,959 2,041 6,210 5,962
Equity in income of affiliate 450 1,000 2,450 3,720
Income before income taxes 3,937 13,588 16,421 41,204
Income tax expense 1,068 5,961 5,568 12,349
Net income $ 2,869 $ 7,627 $ 10,853 $ 28,855
Income per share:        
Basic net income per share (in dollars per share) $ 0.16 $ 0.42 $ 0.60 $ 1.59
Diluted net income per share (in dollars per share) $ 0.16 $ 0.42 $ 0.59 $ 1.57
Basic weighted average shares outstanding (in shares) 18,194 18,119 18,177 18,175
Diluted weighted average shares outstanding (in shares) 18,287 18,320 18,258 18,346