Share-Based Payments (Schedule Of Information Regarding Share-Based Payments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 5,298	$ 3,320	$ 9,690	$ 7,261
Tax benefit on share-based payments expense	2,066	1,289	3,774	2,807
Share-based compensation - stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	33	40	80	181
Share-based compensation - restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	4,452	2,039	7,982	4,598
Share-based payments for content arrangements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments expense	$ 813	$ 1,241	$ 1,628	$ 2,482