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Consolidated Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating revenue $ 218,646 $ 199,023
Operating expenses (income):    
Salaries, wages and benefits 72,761 63,524
Purchased transportation 40,445 38,249
Fuel and fuel taxes 28,297 27,677
Supplies and maintenance 12,228 11,121
Depreciation 25,427 22,543
Operating taxes and licenses 2,639 2,333
Insurance and claims 12,284 9,875
Communications and utilities 1,985 1,950
Gain on disposition of revenue equipment (1,555) (1,548)
Other 6,103 5,566
Total operating expenses 200,614 181,290
Operating income 18,032 17,733
Other (97) (278)
Income before income taxes 18,129 18,011
Income taxes expense 4,411 4,465
Net income $ 13,718 $ 13,546
Basic earnings per common share (in dollars per share) $ 0.25 $ 0.25
Diluted earnings per common share (in dollars per share) 0.25 0.25
Dividends declared per common share (in dollars per share) $ 0.04 $ 0.03