Share-Based Compensation (Summary Of Stock Appreciation Rights) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax Benefit Realized from Exercise of SARs	$ 3,848,000	$ 629,000	$ 1,370,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Appreciation Rights, Outstanding at December 31, 2012	507,358
Number of Rights, Exercised	(224,137)
Stock Appreciation Rights, Outstanding at December 31, 2013	283,221	507,358
Number of Rights, Exercisable at December 31, 2013	283,221
Weighted-Average Exercise Price, Outstanding at December 31, 2012	$ 28.92
Weighted-Average Exercise Price, Exercised	$ 28.92
Weighted-Average Exercise Price, Exercisable at December 31, 2013	$ 28.92
Share-based Compensation Arrangement by Share-based Payment Award, Rights, Outstanding, Weighted Average Remaining Contractual Term	6 years 40 days
Share-based Compensation Arrangement by Share-based Payment Award, Rights, Exercisable, Number	6 years 40 days
Share-based Compensation Arrangement by Share-based Payment Award, Rights, Outstanding, Intrinsic Value	3,056,000
Share-based Compensation Arrangement by Share-based Payment Award, Rights, Exercisable, Intrinsic Value	3,056,000
Payment To Settle Stock Appreciation Rights Exercised	2,382,000	51,000	559,000
Tax Benefit Realized from Exercise of SARs	929,000	20,000	218,000
Accrued liability for cash-settled SARs	$ 4,300,000	$ 3,600,000
Share Based Compensation Arrangement By Share Based Payment Award fair Value Per SAR	$ 15.13	$ 7.43