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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
Revenue | $ 3,373,898 | $ 3,124,108 | $ 2,751,534
Transportation costs | 3,002,875 | 2,768,042 | 2,438,986
Gross margin | 371,023 | 356,066 | 312,548
Costs and expenses: |  |  |
Salaries and benefits | 135,341 | 129,143 | 121,044
Agent fees and commissions | 55,789 | 55,112 | 41,491
General and administrative | 56,772 | 52,832 | 49,951
Depreciation and amortization | 6,470 | 6,619 | 5,603
Impairment of trade name | 2,904 |  |
Total costs and expenses | 257,276 | 243,706 | 218,089
Operating income | 113,747 | 112,360 | 94,459
Other income (expense): |  |  |
Interest expense | (1,246) | (1,207) | (638)
Interest and dividend income | 82 | 134 | 148
Other, net | (28) | (30) | 328
Total expense | (1,192) | (1,103) | (162)
Income before provision for income taxes | 112,555 | 111,257 | 94,297
Provision for income taxes | 43,445 | 43,304 | 36,119
Net income | 69,110 | 67,953 | 58,178
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustments | (86) | (3) | (2)
Total comprehensive income | $ 69,024 | $ 67,950 | $ 58,176
Basic earnings per common share | $ 1.88 | $ 1.83 | $ 1.58
Diluted earnings per common share | $ 1.87 | $ 1.83 | $ 1.57
Basic weighted average number of shares outstanding | 36,829 | 37,053 | 36,913
Diluted weighted average number of shares outstanding | 36,982 | 37,185 | 37,063

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