Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 586,533	$ 76,748
Goodwill, Acquired During Period	497,428
Goodwill, Subsequent Recognition of Deferred Tax Asset	(639)
Goodwill, Translation Adjustments	12,996
National Networks [Member]
Goodwill [Line Items]
Goodwill	76,109	76,748
Goodwill, Acquired During Period	0
Goodwill, Subsequent Recognition of Deferred Tax Asset	(639)
Goodwill, Translation Adjustments	0
International And Other [Member]
Goodwill [Line Items]
Goodwill	510,424	0
Goodwill, Acquired During Period	497,428
Goodwill, Subsequent Recognition of Deferred Tax Asset	0
Goodwill, Translation Adjustments	$ 12,996