Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill	$ 734,356
Goodwill, Period Increase (Decrease)	802
Goodwill, Subsequent Recognition of Deferred Tax Asset	(1,262)
Goodwill, Translation Adjustments	(6,690)
Goodwill	727,206
National Networks [Member]
Goodwill [Line Items]
Goodwill	250,595
Goodwill, Period Increase (Decrease)	(2,994)
Goodwill, Subsequent Recognition of Deferred Tax Asset	(1,262)
Goodwill, Translation Adjustments	0
Goodwill	246,339
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	(6,690)
Goodwill	$ 480,867