Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 4,837	$ 8,792
Tax benefit on share-based compensation expense	1,799	3,334
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	577	769
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	2,615	2,680
Content Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 1,645	$ 5,343