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Acquisitions (Pro Forma Consolidated Results Of Operation) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Acquisitions [Abstract]    
Revenue $ 2,929,813 $ 2,515,219
Net income $ 58,991 $ 44,824
Basic $ 1.60 $ 1.20
Diluted $ 1.59 $ 1.20