Stock-Based Compensation (Summary Of SAR Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,787,376
Granted, Shares	213,721
Forfeited, Shares	(1,521)
Expired, Shares	0
Exercised, Shares	(279,530)
Outstanding, Shares, Ending Balance	1,720,046
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 36.07
Granted, Weighted Average Exercise Price	$ 39.03
Forfeited, Weighted Average Exercise Price	$ 31.31
Expired, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 36.44
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 36.38
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 2 months
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 12,776