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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenue $ 932,814 $ 899,869 $ 2,594,230 $ 2,635,323
Transportation costs 821,360 794,805 2,259,899 2,339,402
Gross margin 111,454 105,064 334,331 295,921
Costs and expenses:        
Salaries and benefits 42,610 36,357 130,075 114,670
Agent fees and commissions 19,072 17,862 54,334 49,374
General and administrative 17,641 15,461 50,368 44,295
Depreciation and amortization 2,276 1,966 6,559 5,893
Total costs and expenses 81,599 71,646 241,336 214,232
Operating income 29,855 33,418 92,995 81,689
Other income (expense):        
Interest expense (888) (757) (2,655) (2,218)
Interest and dividend income 104 22 286 47
Other, net 27 (952) 1,178 (2,095)
Total other expense (757) (1,687) (1,191) (4,266)
Income before provision for income taxes 29,098 31,731 91,804 77,423
Provision for income taxes 11,174 11,899 35,243 28,848
Net income 17,924 19,832 56,561 48,575
Other comprehensive income:        
Foreign currency translation adjustments (10) (80) (63) (100)
Total comprehensive income $ 17,914 $ 19,752 $ 56,498 $ 48,475
Basic earnings per common share $ 0.54 $ 0.55 $ 1.66 $ 1.35
Diluted earnings per common share $ 0.54 $ 0.55 $ 1.66 $ 1.35
Basic weighted average number of shares outstanding 33,212 35,769 34,098 35,970
Diluted weighted average number of shares outstanding 33,366 35,903 34,172 36,049