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Consolidated Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue Equipment [Member]        
Operating expenses (income):        
Gain on disposition assets $ (1,787) $ (1,278) $ (2,948) $ (1,941)
Facility [Member]        
Operating expenses (income):        
Gain on disposition assets     (3,712)  
Operating revenue $ 163,588 $ 168,423 324,875 $ 327,832
Salaries, wages and benefits 50,964 44,667 99,772 88,399
Purchased transportation 28,083 30,739 57,587 58,869
Fuel and fuel taxes 28,281 40,494 54,757 80,320
Supplies and maintenance 10,942 10,351 21,384 20,786
Depreciation 18,311 16,865 36,138 33,236
Operating taxes and licenses 2,014 1,728 3,890 3,441
Insurance and claims 6,778 6,663 14,868 12,788
Communications and utilities 1,388 1,311 2,916 2,744
Other 4,453 3,951 8,751 7,618
Total operating expenses 149,427 155,491 293,403 306,260
Operating income 14,161 12,932 31,472 21,572
Other 6 (612) 21 (710)
Income before income taxes 14,155 13,544 31,451 22,282
Provision for income taxes 5,798 5,618 12,906 9,069
Net income $ 8,357 $ 7,926 $ 18,545 $ 13,213
Basic earnings per common share (in dollars per share) $ 0.25 $ 0.24 $ 0.55 $ 0.40
Diluted earnings per common share (in dollars per share) 0.25 0.24 0.55 0.39
Dividends declared per common share (in dollars per share) $ 0.025 $ 0.025 $ 0.05 $ 0.05