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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Revenue | $ 4,034,897 | $ 3,572,790 | $ 3,525,595
Transportation costs | 3,577,380 | 3,118,005 | 3,112,900
Gross margin | 457,517 | 454,785 | 412,695
Costs and expenses: |  |  |
Salaries and benefits | 188,389 | 180,459 | 158,938
Agent fees and commissions | 74,082 | 72,896 | 68,724
General and administrative | 85,182 | 68,630 | 60,015
Depreciation and amortization | 13,313 | 8,966 | 7,988
Total costs and expenses | 360,966 | 330,951 | 295,665
Operating income | 96,551 | 123,834 | 117,030
Other income (expense): |  |  |
Interest expense | (6,754) | (3,625) | (2,971)
Interest and dividend income | 416 | 393 | 83
Other, net | 724 | 819 | (2,560)
Total other expense | (5,614) | (2,413) | (5,448)
Income before provision for income taxes | 90,937 | 121,421 | 111,582
Income tax (benefit) expense | (44,216) | 46,616 | 40,633
Net income | 135,153 | 74,805 | 70,949
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustments | 79 | (95) | (101)
Total comprehensive income | $ 135,232 | $ 74,710 | $ 70,848
Basic earnings per common share | $ 4.07 | $ 2.21 | $ 1.98
Diluted earnings per common share | $ 4.05 | $ 2.20 | $ 1.97
Basic weighted average number of shares outstanding | 33,220 | 33,841 | 35,876
Diluted weighted average number of shares outstanding | 33,350 | 33,949 | 35,968

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