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Consolidated Statements of Income (Parenthetical) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements of Income    
Compensation and related costs, share-based compensation$ 11,662$ 10,944$ 34,490$ 30,049