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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |  |
Revenues | $ 1,149,890 |  | $ 1,077,435 | $ 889,065
Operating costs and expenses: |  |  |  |
Costs of services provided | 995,104 |  | 930,814 | 766,958
Selling, general and administrative | 91,998 |  | 79,277 | 65,306
Other income: |  |  |  |
Investment and interest | 3,701 |  | 2,920 | 1,011
Income before income taxes | 66,489 |  | 70,264 | 57,812
Income taxes | 19,360 |  | 26,050 | 19,656
Net income | 47,129 |  | 44,214 | 38,156
Per share data: |  |  |  |
Basic earnings per common share (in dollars per share) | $ 0.68 |  | $ 0.65 | $ 0.57
Diluted earnings per common share (in dollars per share) | $ 0.67 |  | $ 0.65 | $ 0.56
Weighted average number of common shares outstanding: |  |  |  |
Basic (in shares) | 69,206 |  | 67,511 | 66,637
Diluted (in shares) | 70,045 |  | 68,485 | 67,585
Comprehensive income: |  |  |  |
Net income | 47,129 |  | 44,214 | 38,156
Other comprehensive income: |  |  |  |
Unrealized gain/(loss) on available for sale marketable securities, net of taxes | (78) | [1] | (216) | 421
Total comprehensive income | $ 47,051 |  | $ 43,998 | $ 38,577
[1] | All amounts are net of tax.

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