Stock-Based Compensation (Summary Of SAR Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,780,578	1,983,083
Granted, Shares	231,745
Forfeited, Shares	(1,492)
Expired, Shares	(173)
Exercised, Shares	(27,575)
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 33.96
Granted, Weighted Average Exercise Price	$ 41.38
Forfeited, Weighted Average Exercise Price	$ 39.11
Expired, Weighted Average Exercise Price	$ 36.77
Exercised, Weighted Average Exercise Price	$ 33.30
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 34.83
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 3 months
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 14,860