Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 3,079	$ 3,843	$ 8,680	$ 6,844
Tax benefit on share-based compensation expense	1,182	1,459	3,289	2,627
Per share weighted average grant date fair value of restricted stock granted				$ 72.08
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	223	321	898	456
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	3,443	2,691	5,306	6,357
Content Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ (587)	$ 831	$ 2,476	$ 31