Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 3,249	$ 2,774	$ 10,093	$ 11,454
Tax benefit on share-based compensation expense	1,246	1,040	3,873	4,329
Per share weighted average grant date fair value of restricted stock granted			$ 71.66
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	163	348	619	1,246
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	3,115	2,986	9,472	8,292
Content Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ (29)	$ (560)	$ 2	$ 1,916