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Unaudited Quarterly Financial Results (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 380,381,000 | $ 374,511,000 | $ 265,863,000 | $ 156,760,000 | $ 148,029,000 | $ 147,014,000 | $ 132,862,000 | $ 119,734,000 | $ 1,177,515,000 | $ 547,639,000 | $ 401,320,000
Gross profit | 115,619,000 | 115,631,000 | 84,537,000 | 52,749,000 | 50,151,000 | 50,793,000 | 46,179,000 | 40,705,000 | 368,536,000 | 187,828,000 | 139,331,000
Income from continuing operations | 9,748,000 | 16,586,000 | 7,030,000 | 5,047,000 | 6,636,000 | 6,843,000 | 5,450,000 | 2,821,000 | 38,411,000 | 21,750,000 | 4,084,000
Income (loss) from discontinued operations, net of income taxes | 1,574,000 | 847,000 | 1,485,000 | 336,000 | 865,000 | 924,000 | 415,000 | 343,000 | 4,242,000 | 2,547,000 | (13,981,000)
Net income | 11,322,000 | 17,433,000 | 8,515,000 | 5,383,000 | 7,501,000 | 7,767,000 | 5,865,000 | 3,164,000 | 42,653,000 | 24,297,000 | (9,897,000)
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 0.19 | $ 0.32 | $ 0.16 | $ 0.14 | $ 0.18 | $ 0.18 | $ 0.15 | $ 0.08 | $ 0.82 | $ 0.59 | $ 0.11
Income from discontinued operations | $ 0.03 | $ 0.01 | $ 0.03 | $ 0 | $ 0.02 | $ 0.03 | $ 0.01 | $ 0.01 | $ 0.09 | $ 0.07 | $ (0.38)
Net income | $ 0.22 | $ 0.33 | $ 0.19 | $ 0.14 | $ 0.20 | $ 0.21 | $ 0.16 | $ 0.09 | $ 0.91 | $ 0.66 | $ (0.27)
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 0.18 | $ 0.31 | $ 0.15 | $ 0.13 | $ 0.18 | $ 0.18 | $ 0.14 | $ 0.08 | $ 0.80 | $ 0.58 | $ 0.11
Income from discontinued operations | $ 0.03 | $ 0.02 | $ 0.04 | $ 0.01 | $ 0.02 | $ 0.03 | $ 0.02 | $ 0.00 | $ 0.09 | $ 0.06 | $ (0.38)
Net income | $ 0.21 | $ 0.33 | $ 0.19 | $ 0.14 | $ 0.20 | $ 0.21 | $ 0.16 | $ 0.08 | $ 0.89 | $ 0.64 | $ (0.27)
Vendor Fees [Member] | Apex Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Classification error related to vendor fees |  | $ 500,000 |  |  |  |  |  |  |  |  |

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