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Acquisitions (Schedule Of Pro Forma Results Of Operations) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Acquisitions [Abstract]    
Net revenue $ 658,535 $ 583,491
Net income attributable to controlling interests and available to common stockholders $ 66,270 $ 44,082
Pro forma earnings per share - basic $ 1.57 $ 1.09
Pro forma earnings per share - diluted $ 1.55 $ 1.07