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Pro Forma Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Business Combinations [Abstract]
Revenue and other income	$ 606,602
Net income	$ 94,094
Net income per share - basic	$ 0.34
Net income per share - diluted	$ 0.33

- 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