Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
December 31, 2018	$ 798,037
Purchase accounting adjustments	(3,848)
Amortization of second component goodwill	(664)
Foreign currency translation	(1,442)
June 30, 2019	792,083
National Networks
Goodwill [Roll Forward]
December 31, 2018	238,431
Purchase accounting adjustments	0
Amortization of second component goodwill	(664)
Foreign currency translation	0
June 30, 2019	237,767
International and Other
Goodwill [Roll Forward]
December 31, 2018	559,606
Purchase accounting adjustments	(3,848)
Amortization of second component goodwill	0
Foreign currency translation	(1,442)
June 30, 2019	$ 554,316

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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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