Stock-Based Compensation (Summary Of SAR Activity) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,780,578
Granted, Shares	240,267
Forfeited, Shares	(6,182)
Expired, Shares	(1,076)
Exercised, Shares	(411,126)
Outstanding, Shares, Ending Balance	1,602,461
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 33.96
Granted, Weighted Average Exercise Price | $ / shares	41.40
Forfeited, Weighted Average Exercise Price | $ / shares	39.04
Expired, Weighted Average Exercise Price | $ / shares	37.31
Exercised, Weighted Average Exercise Price | $ / shares	32.94
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	$ 35.32
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 5 months
Outstanding, Aggregate Intrinsic Value, Ending Balance | $	$ 16,412