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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement [Abstract] |  |  |
Revenue | $ 3,572,790 | $ 3,525,595 | $ 3,571,126
Transportation costs | 3,118,005 | 3,112,900 | 3,200,691
Gross margin | 454,785 | 412,695 | 370,435
Costs and expenses: |  |  |
Salaries and benefits | 180,459 | 158,938 | 136,480
Agent fees and commissions | 72,896 | 68,724 | 62,041
General and administrative | 68,630 | 60,015 | 58,014
Depreciation and amortization | 8,966 | 7,988 | 7,799
Driver settlements and related costs |  |  | 10,343
Impairment of software |  |  | 11,881
Total costs and expenses | 330,951 | 295,665 | 286,558
Operating income | 123,834 | 117,030 | 83,877
Other income (expense): |  |  |
Interest expense | (3,625) | (2,971) | (1,785)
Interest and dividend income | 393 | 83 | 32
Other, net | 819 | (2,560) | (257)
Total other expense | (2,413) | (5,448) | (2,010)
Income before provision for income taxes | 121,421 | 111,582 | 81,867
Provision for income taxes | 46,616 | 40,633 | 30,309
Net income | 74,805 | 70,949 | 51,558
Other comprehensive (loss) income: |  |  |
Foreign currency translation adjustments | (95) | (101) | 8
Total comprehensive income | $ 74,710 | $ 70,848 | $ 51,566
Basic earnings per common share | $ 2.21 | $ 1.98 | $ 1.41
Diluted earnings per common share | $ 2.20 | $ 1.97 | $ 1.40
Basic weighted average number of shares outstanding | 33,841 | 35,876 | 36,590
Diluted weighted average number of shares outstanding | 33,949 | 35,968 | 36,732

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