Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill	$ 695,158	$ 657,708
Amortization of second component goodwill	(1,328)	(2,544)
Foreign currency translation	(19,658)	39,994
Additions	123,865
Goodwill	798,037	695,158
National Networks [Member]
Goodwill [Roll Forward]
Goodwill	239,759	242,303
Amortization of second component goodwill	(1,328)	(2,544)
Foreign currency translation	0	0
Additions	0
Goodwill	238,431	239,759
International And Other [Member]
Goodwill [Roll Forward]
Goodwill	455,399	415,405
Amortization of second component goodwill	0	0
Foreign currency translation	(19,658)	39,994
Additions	123,865
Goodwill	$ 559,606	$ 455,399

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.

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-Publisher FASB
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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.

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