Stock-Based Compensation (Summary Of SAR Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Y
Stock Appreciation Rights [Roll Forward]
Outstanding, Shares, Beginning Balance	1,739,126
Granted, Shares	0
Forfeited, Shares	0
Expired, Shares	0
Exercised, Shares	(12,766)
Outstanding, Shares, Ending Balance	1,726,360
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 37.83
Granted, Weighted Average Exercise Price	$ 0.00
Forfeited, Weighted Average Exercise Price	$ 0.00
Expired, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 35.63
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 37.84
Outstanding, Weighted Average Remaining Contractual Term (in years)	4.7
Outstanding, Aggregate Intrinsic Value, Ending Balance	$ 986