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Acquisitions (Schedule of Supplemental Unaudited Proforma Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Pro Forma Information [Abstract]
Total Revenue	$ 880,363	$ 836,261
Net Income	$ 49,518	$ 45,251
Basic Net Income Per Share	$ 0.97	$ 0.89
Diluted Net Income Per Share	$ 0.96	$ 0.88

- Definition

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+ Details

- Definition

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.

+ References+ Details