Share-Based Compensation (Summary Of Stock-Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at December 31, 2012	2,400,260
Number of Options, Exercised	(760,495)
Number of Options, Expired or cancelled	(151,024)
Number of Options, Outstanding at December 31, 2013	1,488,741	2,400,260
Number of Options, Exercisable at December 31, 2013	1,302,639
Weighted-Average Exercise Price, Outstanding at December 31, 2012	$ 36.05
Weighted- Average Exercise Price, Exercised	$ 27.32
Weighted- Average Exercise Price, Expired or cancelled	$ 45.17
Weighted- Average Exercise Price, Outstanding at December 31, 2013	$ 39.59	$ 36.05
Weighted-Average Exercise Price, Exercisable at December 31, 2013	$ 40.62
Weighted-Average Remaining Contractual Term (years), Outstanding at December 31, 2013	4 years 62 days
Weighted-Average Remaining Contractual Term (years), Exercisable at December 31, 2013	3 years 270 days
Aggregate intrinsic value, Outstanding	$ 6,917
Aggregate intrinsic value, Exercisable	5,550
Aggregate intrinsic value of exercised stock options	9,868	1,614	3,513
Cash received from exercise of stock options	20,777	3,560	5,532
Tax benefit realized from the exercise of options	$ 3,848	$ 629	$ 1,370