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Stock-Based Compensation (Summary of Restricted Stock Activity and Unvested Shares) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Stock-Based Compensation [Abstract]  
Restricted Stock, Unvested shares at December 31, 2011 Number of Shares 1,019,737
Restricted Stock, Granted, Number of Shares 13,254
Restricted Stock, Vested, Number of Shares (39,594)
Restricted Stock, Forfeited, Number of Shares (76,978)
Restricted Stock, Unvested shares at September 30, 2012, Number of Shares 916,419
Restricted Stock, Unvested shares at December 31, 2011 Weighted Average Grant Date Fair Value $ 36.71
Restricted Stock, Granted, Weighted Average Grant Date Fair Value $ 30.20
Restricted Stock, Vested, Weighted Average Grant Date Fair Value $ 39.63
Restricted Stock, Forfeited, Weighted Average Grant Date Fair Value $ 37.08
Restricted Stock, Unvested shares at September 30, 2012, Weighted Average Grant Date Fair Value $ 36.46