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Intangible Assets Intangible Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Renewable investment advisory contracts [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | $ 73,900 | $ 70,400
Trade Names [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 1,900 | 1,900
Customer Relationships [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Net | $ 1,100 | $ 1,700

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- Definition Amount after 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 of assets, excluding financial assets and goodwill, lacking physical substance and having 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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