Share-Based Compensation (Summary Of Stock-Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning options outstanding	1,488,741
Exercised	(926,454)
Expired or cancelled	(15,100)
Ending options outstanding	547,187	1,488,741
Options exercisable	544,184
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 39.59
Weighted-Average Exercise Price, Exercised	$ 36.59
Weighted-Average Exercise Price, Expired or cancelled	$ 50.28
Weighted- Average Exercise Price, Outstanding at ending of period	$ 44.36	$ 39.59
Weighted-Average Exercise Price exercisable at ending of period	$ 44.44
Weighted-Average Remaining Contractual Term (years), Outstanding at ending of period	2 years 321 days
Weighted-Average Remaining Contractual Term (years), Exercisable at ending of period	2 years 314 days
Aggregate intrinsic value, Outstanding	$ 3,461
Aggregate intrinsic value, Exercisable	3,403
Aggregate intrinsic value of exercised stock options	12,177	9,868	1,614
Cash received from exercise of stock options	33,902	20,777	3,560
Tax benefit realized from the exercise of options	$ 4,664	$ 3,848	$ 629