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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Income [Abstract] |  |  |
Revenue | $ 2,751,534 | $ 1,833,737 | $ 1,510,970
Transportation costs | 2,438,986 | 1,620,304 | 1,325,280
Gross margin | 312,548 | 213,433 | 185,690
Costs and expenses: |  |  |
Salaries and benefits | 121,044 | 99,138 | 88,518
Agent fees and commissions | 41,491 | 2,410 | 1,287
General and administrative | 49,951 | 38,211 | 36,180
Depreciation and amortization | 5,603 | 3,792 | 4,174
Total costs and expenses | 218,089 | 143,551 | 130,159
Operating income | 94,459 | 69,882 | 55,531
Other income (expense): |  |  |
Interest expense | (638) | (54) | (91)
Interest and dividend income | 148 | 119 | 146
Other, net | 328 | 146 | 299
Total other (expense) income | (162) | 211 | 354
Income before provision for income taxes | 94,297 | 70,093 | 55,885
Provision for income taxes | 36,119 | 26,635 | 21,620
Net income | $ 58,178 | $ 43,458 | $ 34,265
Basic earnings per common share | $ 1.58 | $ 1.17 | $ 0.92
Diluted earnings per common share | $ 1.57 | $ 1.16 | $ 0.91
Basic weighted average number of shares outstanding | 36,913 | 37,223 | 37,367
Diluted weighted average number of shares outstanding | 37,063 | 37,385 | 37,525

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