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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenue $ 1,054,360 $ 932,814 $ 2,872,321 $ 2,594,230
Transportation costs 937,836 821,360 2,552,895 2,259,899
Gross margin 116,524 111,454 319,426 334,331
Costs and expenses:        
Salaries and benefits 49,126 42,610 137,343 130,075
Agent fees and commissions 19,072 19,072 54,103 54,334
General and administrative 22,403 17,641 63,341 50,368
Depreciation and amortization 4,254 2,276 9,215 6,559
Total costs and expenses 94,855 81,599 264,002 241,336
Operating income 21,669 29,855 55,424 92,995
Other income (expense):        
Interest expense (2,345) (888) (4,474) (2,655)
Interest and dividend income 58 104 388 286
Other, net 404 27 597 1,178
Total other expense (1,883) (757) (3,489) (1,191)
Income before provision for income taxes 19,786 29,098 51,935 91,804
Provision for income taxes 4,452 11,174 16,725 35,243
Net income 15,334 17,924 35,210 56,561
Other comprehensive income:        
Foreign currency translation adjustments 9 (10) 101 (63)
Total comprehensive income $ 15,343 $ 17,914 $ 35,311 $ 56,498
Basic earnings per common share $ 0.46 $ 0.54 $ 1.06 $ 1.66
Diluted earnings per common share $ 0.46 $ 0.54 $ 1.06 $ 1.66
Basic weighted average number of shares outstanding 33,227 33,212 33,217 34,098
Diluted weighted average number of shares outstanding 33,335 33,366 33,323 34,172