Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Goodwill [Line Items]
December 31, 2015	$ 736,275
Purchase accounting adjustments	(6,040)
Impairment charges	(27,244)
Amortization of second component goodwill	(2,546)
Foreign currency translation	(42,737)
December 31, 2016	657,708
National Networks [Member]
Goodwill [Line Items]
December 31, 2015	244,849
Purchase accounting adjustments	0
Impairment charges	0
Amortization of second component goodwill	(2,546)
Foreign currency translation	0
December 31, 2016	242,303
International And Other [Member]
Goodwill [Line Items]
December 31, 2015	491,426
Purchase accounting adjustments	(6,040)
Impairment charges	(27,244)
Amortization of second component goodwill	0
Foreign currency translation	(42,737)
December 31, 2016	$ 415,405

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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