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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
12 Months Ended
Dec. 31, 2012
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Nonvested [Roll Forward]  
Outstanding at January 1, 2012 (non-vested), Grants 1,122,350
Granted, Grants 760,177
Vesting and transfer of ownership to recipients, Grants (1,035,025)
Forfeited, Grants (3,975)
Outstanding at December 31, 2012 (non-vested), Grants 843,527
Outstanding at January 1, 2012 (non-vested), Weighted Average Grant Date Fair Value $ 25.48
Granted, Weighted Average Grant Date Fair Value $ 37.27
Vesting and transfer of ownership to recipients, Weighted Average Grant Date Fair Value $ 26.75
Forfeited, Weighted Average Grant Date Fair Value $ 33.06
Outstanding at December 31, 2012 (non-vested), Weighted Average Grant Date Fair Value $ 34.52
Outstanding at December 31, 2012 (non-vested), Aggregate Intrinsic Value $ 39,266