Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill	$ 734,356
Goodwill, Period Increase (Decrease)	433
Goodwill, Subsequent Recognition of Deferred Tax Asset	(1,893)
Goodwill, Translation Adjustments	(15,839)
Goodwill	717,057
National Networks [Member]
Goodwill [Line Items]
Goodwill	250,595
Goodwill, Period Increase (Decrease)	(3,363)
Goodwill, Subsequent Recognition of Deferred Tax Asset	(1,893)
Goodwill, Translation Adjustments	0
Goodwill	245,339
International And Other [Member]
Goodwill [Line Items]
Goodwill	483,761
Goodwill, Period Increase (Decrease)	3,796
Goodwill, Subsequent Recognition of Deferred Tax Asset	0
Goodwill, Translation Adjustments	(15,839)
Goodwill	$ 471,718