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Goodwill and Other Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 639,157 | $ 615,996
Finite-Lived Intangible Assets, Accumulated Amortization | (201,815) | (150,228)
Finite-Lived Intangible Assets, Net | 437,342 | 465,768
Indefinite-Lived Trademarks | 19,900 | 20,041
Intangible Assets, Gross (Excluding Goodwill) | 659,057 | 636,037
Total intangible assets | 457,242 | 485,809
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 527,713 | 509,992
Finite-Lived Intangible Assets, Accumulated Amortization | (167,911) | (133,932)
Finite-Lived Intangible Assets, Net | $ 359,802 | 376,060
Customer Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 6 years |
Customer Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |
Advertiser Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 46,282 | 46,282
Finite-Lived Intangible Assets, Accumulated Amortization | (13,405) | (9,198)
Finite-Lived Intangible Assets, Net | $ 32,877 | 37,084
Finite-Lived Intangible Asset, Useful Life | 11 years |
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 53,761 | 49,720
Finite-Lived Intangible Assets, Accumulated Amortization | (14,420) | (6,307)
Finite-Lived Intangible Assets, Net | $ 39,341 | 43,413
Finite-Lived Intangible Asset, Useful Life | 20 years |
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 11,401 | 10,002
Finite-Lived Intangible Assets, Accumulated Amortization | (6,079) | (791)
Finite-Lived Intangible Assets, Net | $ 5,322 | $ 9,211
Other Intangible Assets [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |
Other Intangible Assets [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
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 Amount before 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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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