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Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Gross Carrying Amount of Amortizable Intangible Assets | $ 645,742 | $ 639,157
Accumulated amortization | (213,247) | (201,815)
Amortizable intangible assets, net of accumulated amortization | 432,495 | 437,342
Trademarks | 19,900 | 19,900
Intangible Assets, Gross, Excluding Goodwill | 665,642 | 659,057
Total intangible assets, net | 452,395 | 457,242
Affiliate and Customer Relationships [Member] |  |
Gross Carrying Amount of Amortizable Intangible Assets | 532,555 | 527,713
Accumulated amortization | (177,019) | (167,911)
Amortizable intangible assets, net of accumulated amortization | $ 355,536 | 359,802
Advertiser Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 11 years |
Gross Carrying Amount of Amortizable Intangible Assets | $ 46,282 | 46,282
Accumulated amortization | (14,457) | (13,405)
Amortizable intangible assets, net of accumulated amortization | $ 31,825 | 32,877
Trade Names [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |
Gross Carrying Amount of Amortizable Intangible Assets | $ 55,201 | 53,761
Accumulated amortization | (15,422) | (14,420)
Amortizable intangible assets, net of accumulated amortization | 39,779 | 39,341
Other Amortizable Intangible Assets [Member] |  |
Gross Carrying Amount of Amortizable Intangible Assets | 11,704 | 11,401
Accumulated amortization | (6,349) | (6,079)
Amortizable intangible assets, net of accumulated amortization | $ 5,355 | $ 5,322
Minimum [Member] | Affiliate and Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 6 years |
Minimum [Member] | Other Amortizable Intangible Assets [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |
Maximum [Member] | Affiliate and Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |
Maximum [Member] | Other Amortizable Intangible Assets [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |

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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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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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