Stock-Based Compensation (Schedule Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock-Based Compensation [Abstract]
Outstanding at January 1, 2012	339,000
Shares, Granted	22,000
Shares, Exercised	(361,000)
Outstanding at December 31, 2012		339,000
Weighted Average Exercise Price, Outstanding at January 1, 2012	$ 30.86
Weighted Average Exercise Price, Exercised	$ 28.94
Weighted Average Exercise Price, Outstanding at December 31, 2012		$ 30.86
Weighted Average Remaining Contractual Term, Outstanding at January 1, 2012		1 year 6 months
Weighted Average Remaining Contractual Term, Outstanding at December 31, 2012		1 year 6 months
Aggregate Intrinsic Value, Outstanding at January 1, 2012	$ 11,533
Aggregate Intrinsic Value, Outstanding at December 31, 2012		$ 11,533