Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 4,864	$ 3,249	$ 12,125	$ 10,093
Tax benefit on share-based payments expense	1,888	1,246	4,696	3,873
Share-based compensation - stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	57	163	238	619
Share-based compensation - restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	3,566	3,115	8,164	9,472
Share-based payments for content arrangements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 1,241	$ (29)	$ 3,723	$ 2