Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 4,392	$ 3,941
Tax benefit on share-based payments expense	1,708	1,519
Share-based compensation - stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	47	141
Share-based compensation - restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	3,530	2,559
Share-based payments for content arrangements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 815	$ 1,241