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Acquisitions Pro Forma Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
As Reported |  |
Business Acquisition [Line Items] |  |
Total revenue from continuing operations | $ 595,946 | $ 518,344
Income from continuing operations | 81,105 | 70,523
Net income | 80,359 | 77,782
Income from continuing operations per basic share | $ 2.81 | $ 2.30
Income from continuing operations per diluted share | $ 2.73 | $ 2.24
Net income per basic share | $ 2.78 | $ 2.53
Net income per diluted share | $ 2.70 | $ 2.47
Pro Forma |  |
Business Acquisition [Line Items] |  |
Total revenue from continuing operations | 631,873 | 599,528
Income from continuing operations | 85,249 | 80,483
Net income | $ 84,503 | $ 87,742
Income from continuing operations per basic share | $ 2.95 | $ 2.62
Income from continuing operations per diluted share | $ 2.87 | $ 2.56
Net income per basic share | $ 2.92 | $ 2.86
Net income per diluted share | $ 2.84 | $ 2.79

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