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Consolidated Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating revenue $ 197,024 $ 171,511 $ 383,984 $ 344,670
Operating expenses:        
Salaries, wages and benefits 63,250 56,715 122,072 113,115
Purchased transportation 35,048 27,516 70,074 56,878
Fuel and fuel taxes 31,742 25,007 60,786 50,963
Supplies and maintenance 10,251 10,541 20,687 21,531
Depreciation 22,193 21,306 44,008 42,689
Operating taxes and licenses 2,364 2,252 4,651 4,499
Insurance and claims 8,941 8,848 19,231 17,762
Communications and utilities 1,647 1,487 3,330 3,068
Other 5,525 4,141 10,699 7,632
Total operating expenses 178,801 155,942 352,167 315,163
Operating income 18,223 15,569 31,817 29,507
Other (138) 125 (327) 266
Income before income taxes 18,361 15,444 32,144 29,241
Income taxes expense 4,659 6,303 8,111 11,886
Net income $ 13,702 $ 9,141 $ 24,033 $ 17,355
Basic earnings per common share (in dollars per share) $ 0.25 $ 0.17 $ 0.44 $ 0.32
Diluted earnings per common share (in dollars per share) 0.25 0.17 0.44 0.32
Dividends declared per common share (in dollars per share) $ 0.025 $ 0.015 $ 0.05 $ 0.03
Revenue Equipment [Member]        
Operating expenses:        
Gain on disposition of assets $ (2,160) $ (1,871) $ (3,371) $ (2,974)