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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
6 Months Ended
Jun. 30, 2014
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 2 months 13 days
Total unrecognized compensation cost related to non-vested grants $ 13,100,000
Fair value of restricted stock vested 3,500,000
Outstanding at January 1, 2014 (non-vested) 737,562
Granted 70,243
Vesting (transfer/conversion to common stock) (103,586)
Forfeited (72,697)
Outstanding at June 30, 2014 (non-vested) 631,522
Outstanding at January 1, 2014 (non-vested), Weighted Average Grant Date Fair Value $ 39.54
Granted, Weighted Average Grant Date Fair Value $ 48.22
Vesting and transfer of ownership to recipients, Weighted Average Grant Date Fair Value $ 33.71
Forfeited, Weighted Average Grant Date Fair Value, per share $ 42.24
Outstanding at March 31, 2014 (non-vested), Weighted Average Grant Date Fair Value $ 41.15
Aggregate Intrinsic Value $ 27,591,000