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Stock-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Stock-Based Compensation [Abstract]  
Proceeds from stock option exercises$ 7,239$ 28,530
Stock option exercises and deferred stock140,739 
Issuance of treasury stock - deferred stock conversions3,464