Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
December 31, 2018	$ 798,037
Puchase accounting adjustments	(1,748)
Amortization of second component goodwill	(332)
Foreign currency translation	1,836
March 31, 2019	797,793
National Networks
Goodwill [Roll Forward]
December 31, 2018	238,431
Puchase accounting adjustments	0
Amortization of second component goodwill	(332)
Foreign currency translation	0
March 31, 2019	238,099
International and Other
Goodwill [Roll Forward]
December 31, 2018	559,606
Puchase accounting adjustments	(1,748)
Amortization of second component goodwill	0
Foreign currency translation	1,836
March 31, 2019	$ 559,694

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 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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