Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance	1,259,689
Granted, Shares	208,623
Vested, Shares	(136,747)
Forfeited, Shares	(8,368)
Nonvested, Shares, Ending Balance	1,323,197
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance	$ 34.41
Granted , Weighted Average Grant Date Fair Value	41.60
Vested , Weighted Average Grant Date Fair Value	29.95
Forfeited , Weighted Average Grant Date Fair Value	34.46
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance	$ 36.00