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Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition 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. + References 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 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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