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Consolidated Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating revenue $ 170,679 $ 170,464 $ 515,349 $ 498,483
Operating expenses (income):        
Salaries, wages and benefits 53,594 57,090 166,709 168,116
Purchased transportation 28,668 27,775 85,546 81,997
Fuel and fuel taxes 26,143 24,845 77,106 68,405
Supplies and maintenance 10,381 11,618 31,912 33,025
Depreciation 21,186 20,790 63,875 61,205
Operating taxes and licenses 2,314 2,297 6,813 6,732
Insurance and claims 11,336 8,194 29,098 23,245
Communications and utilities 1,463 1,584 4,531 4,701
Other 4,480 4,727 12,112 14,749
Total operating expenses 157,657 155,595 472,820 454,713
Operating income 13,022 14,869 42,529 43,770
Other 14 342 280 794
Income before income taxes 13,008 14,527 42,249 42,976
Provision for income taxes 5,153 6,090 17,039 17,815
Net income $ 7,855 $ 8,437 $ 25,210 $ 25,161
Basic earnings per common share (in dollars per share) $ 0.14 $ 0.16 $ 0.46 $ 0.46
Diluted earnings per common share (in dollars per share) 0.14 0.15 0.46 0.46
Dividends declared per common share (in dollars per share) $ 0.025 $ 0.015 $ 0.055 $ 0.045
Revenue Equipment [Member]        
Operating expenses (income):        
Gain on disposition of assets $ (1,908) $ (3,325) $ (4,882) $ (7,462)