Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Nonvested Share Awards [Roll Forward]
Nonvested, Shares, Beginning Balance	1,143,755
Granted, Shares	181,448
Vested, Shares	(84,542)
Forfeited, Shares	(22,491)
Nonvested, Shares, Ending Balance	1,218,170
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance	$ 34.27
Granted , Weighted Average Grant Date Fair Value	$ 44.59
Vested , Weighted Average Grant Date Fair Value	$ 29.48
Forfeited , Weighted Average Grant Date Fair Value	$ 39.05
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance	$ 36.05