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Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Gross Carrying Amount of Amortizable Intangible Assets | $ 636,079 | $ 615,996
Accumulated amortization | (182,280) | (150,228)
Amortizable intangible assets, net of accumulated amortization | 453,799 | 465,768
Trademarks | 19,900 | 20,041
Intangible Assets, Gross, Excluding Goodwill | 655,979 | 636,037
Total intangible assets, net | 473,699 | 485,809
Affiliate and Customer Relationships [Member] |  |
Gross Carrying Amount of Amortizable Intangible Assets | 525,499 | 509,992
Accumulated amortization | (159,790) | (133,932)
Amortizable intangible assets, net of accumulated amortization | $ 365,709 | 376,060
Advertiser Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 11 years |
Gross Carrying Amount of Amortizable Intangible Assets | $ 46,282 | 46,282
Accumulated amortization | (12,354) | (9,198)
Amortizable intangible assets, net of accumulated amortization | 33,928 | 37,084
Trade Names [Member] |  |
Gross Carrying Amount of Amortizable Intangible Assets | 53,078 | 49,720
Accumulated amortization | (8,682) | (6,307)
Amortizable intangible assets, net of accumulated amortization | $ 44,396 | 43,413
Other Amortizable Intangible Assets [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |
Gross Carrying Amount of Amortizable Intangible Assets | $ 11,220 | 10,002
Accumulated amortization | (1,454) | (791)
Amortizable intangible assets, net of accumulated amortization | $ 9,766 | $ 9,211
Minimum [Member] | Affiliate and Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Minimum [Member] | Trade Names [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |
Maximum [Member] | Affiliate and Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |
Maximum [Member] | Trade Names [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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