Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
December 31, 2015	$ 657,708	$ 736,275
Purchase accounting adjustments		(6,040)
Impairment charges (see Note 3)		(27,244)
December 31, 2016	657,708	736,275
Amortization of second component goodwill	(2,544)	(2,546)
Foreign currency translation	39,994	(42,737)
December 31, 2017	695,158	657,708
National Networks [Member]
Goodwill [Line Items]
December 31, 2015	242,303	244,849
Purchase accounting adjustments		0
Impairment charges (see Note 3)		0
December 31, 2016	242,303	244,849
Amortization of second component goodwill	(2,544)	(2,546)
Foreign currency translation	0	0
December 31, 2017	239,759	242,303
International And Other [Member]
Goodwill [Line Items]
December 31, 2015	415,405	491,426
Purchase accounting adjustments		(6,040)
Impairment charges (see Note 3)		(27,244)
December 31, 2016	415,405	491,426
Amortization of second component goodwill	0	0
Foreign currency translation	39,994	(42,737)
December 31, 2017	$ 455,399	$ 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
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