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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenue $ 698,120 $ 671,144 $ 664,994
Operating expenses (income):      
Salaries, wages and benefits 226,091 224,827 209,455
Purchased transportation 118,349 110,719 118,030
Fuel and fuel taxes 105,390 94,075 104,582
Supplies and maintenance 41,613 43,912 43,319
Depreciation 85,120 82,445 75,323
Operating taxes and licenses 8,993 9,099 8,914
Insurance and claims 38,585 32,223 29,252
Communications and utilities 6,047 6,287 5,886
Other 16,569 19,756 18,858
641,258 612,841 603,931
Operating income 56,862 58,303 61,063
Other 389 1,237 372
Income before income taxes 56,473 57,066 60,691
Income taxes (benefit) expense (33,811) 23,602 24,946
Net income $ 90,284 $ 33,464 $ 35,745
Basic earnings per common share (in dollars per share) $ 1.66 $ 0.62 $ 0.64
Diluted earnings per common share (in dollars per share) 1.65 0.61 0.64
Dividends declared per common share (in dollars per share) $ 0.08 $ 0.06 $ 0.06
Revenue Equipment [Member]      
Operating expenses (income):      
Gain on disposition of assets $ (5,499) $ (10,502) $ (5,584)
Facility [Member]      
Operating expenses (income):      
Gain on disposition of assets $ (4,104)