Share-Based Compensation (Summary Of Vested And Unvested RSU) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Shares	89,000	[1]	80,000	[1]	55,000	[1]
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Balance	135,000		55,000		0
Granted, Shares	92,000		80,000		55,000
Vested, Shares	0		0		0
Forfeited/Canceled, Shares	(3,000)		0		0
Expired, Shares	(55,000)		0		0
Outstanding Shares, Balance	169,000		135,000		55,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, Weighted-Average Fair Value per Share (in dollars per share)	40.70		41.40		0.00
Granted, Weighted-Average Fair Value per Share (in dollars per share)	44.01		40.22		41.40
Outstanding, Weighted-Average Fair Value per Share (in dollars per share)	42.22		40.70		41.40

[1] 2010 grant includes 10,000 shares of restricted stock.