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

Business acquisitions pro forma revenue from continuing operations

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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