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Stock Repurchase Program And Shares Withheld From Vested Restricted Shares - Narrative (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Mar. 04, 2008
2008 share repurchase program
Nov. 30, 2011
2008 repurchase program expansion
Aug. 24, 2011
2008 repurchase program expansion
Equity, Class of Treasury Stock [Line Items]      
Share repurchase program, authorized amount $ 50 $ 50 $ 36