Share-Based Compensation (Summary Of Unvested Performance-Based Restricted Stock Awards, Including Changes During The Year) (Details) (Performance-Based Restricted Stock Awards [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Performance-Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at December 31, 2014	380
Granted, awards	205
Vested, awards	(59)
Unvested at March 31, 2015	526
Unvested weighted average grant-date fair value at December 31, 2014	$ 59.41
Granted, weighted average grant-date fair value	$ 64.18
Vested, weighted average grant-date fair value	$ 61.33
Unvested weighted average grant-date fair value at March 31, 2015	$ 61.06