Stock-Based Compensation (Summary Of SAR Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,758,254
Granted, Shares	172,968
Forfeited, Shares	0
Expired, Shares	0
Exercised, Shares	(34,894)
Outstanding, Shares, Ending Balance	1,896,328
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 34.68
Granted, Weighted Average Exercise Price	$ 44.52
Forfeited, Weighted Average Exercise Price	$ 0.00
Expired, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 33.35
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 35.60
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 4 months
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 20,521