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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
3 Months Ended
Mar. 31, 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 4 months
Total unrecognized compensation cost related to non-vested grants $ 16,900,000
Fair value of restricted stock vested 3,000,000
Outstanding at January 1, 2014 (non-vested) 737,562
Granted 56,482
Vesting (transfer/conversion to common stock) (92,240)
Forfeited (56,567)
Outstanding at March 31, 2014 (non-vested) 645,237
Outstanding at January 1, 2014 (non-vested), Weighted Average Grant Date Fair Value $ 39.54
Granted, Weighted Average Grant Date Fair Value $ 47.92
Vesting and transfer of ownership to recipients, Weighted Average Grant Date Fair Value $ 32.76
Forfeited, Weighted Average Grant Date Fair Value, per share $ 41.86
Outstanding at March 31, 2014 (non-vested), Weighted Average Grant Date Fair Value $ 41.04
Aggregate Intrinsic Value $ 30,700,000