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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2012 (non-vested), Grants 1,122,350
Granted, Grants 420,922
Vesting and transfer of ownership to recipients, Grants (574,408)
Forfeited in Period (3,975)
Outstanding at September 30, 2012 (non-vested), Grants 964,889
Outstanding at January 1, 2012 (non-vested), Weighted Average Grant Date Fair Value $ 25.48
Granted, Weighted Average Grant Date Fair Value $ 33.97
Vesting and transfer of ownership to recipients, Weighted Average Grant Date Fair Value $ 23.48
Outstanding at September 30, 2012 (non-vested), Weighted Average Grant Date Fair Value $ 30.35
Outstanding at Septembert 30, 2012 (non-vested), Aggregate Intrinsic Value $ 39,821
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value, per share $ 33.06