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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Income Statement [Abstract] |  |  |  |  |
Revenues | $ 273,604 | $ 267,108 | $ 547,508 |  | $ 527,715
Operating costs and expenses: |  |  |  |  |
Costs of services provided | 234,602 | 230,206 | 469,793 |  | 457,701
Selling, general and administrative | 19,363 | 18,524 | 40,153 |  | 39,506
Other income: |  |  |  |  |
Investment and interest | 219 | (95) | 1,253 |  | 1,558
Income before income taxes | 19,858 | 18,283 | 38,815 |  | 32,066
Income taxes | 6,925 | 6,963 | 10,928 |  | 12,167
Net income | 12,933 | 11,320 | 27,887 |  | 19,899
Per share data: |  |  |  |  |
Basic earnings per common share (dollars per share) | $ 0.19 | $ 0.17 | $ 0.41 |  | $ 0.30
Diluted earnings per common share (dollars per share) | $ 0.19 | $ 0.17 | $ 0.40 |  | $ 0.29
Weighted average number of common shares outstanding: |  |  |  |  |
Basic (shares) | 68,599 | 67,296 | 68,531 |  | 67,189
Diluted (shares) | 69,370 | 68,228 | 69,366 |  | 68,155
Comprehensive income: |  |  |  |  |
Net income | 12,933 | 11,320 | 27,887 |  | 19,899
Other comprehensive income: |  |  |  |  |
Unrealized loss on available for sale marketable securities, net of taxes | (106) | (17) | (83) | [1] | (190)
Total comprehensive income | $ 12,827 | $ 11,303 | $ 27,804 |  | $ 19,709
[1] | All amounts are net of tax.

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