Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
December 31, 2017	$ 695,158
Amortization of second component goodwill	(328)
Foreign currency translation	12,824
March 31, 2018	707,654
National Networks [Member]
Goodwill [Roll Forward]
December 31, 2017	239,759
Amortization of second component goodwill	(328)
Foreign currency translation	0
March 31, 2018	239,431
International And Other [Member]
Goodwill [Roll Forward]
December 31, 2017	455,399
Amortization of second component goodwill	0
Foreign currency translation	12,824
March 31, 2018	$ 468,223

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
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of (increase) decrease to an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from the subsequent recognition of deferred tax assets.

+ References

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