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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Details) - Consolidated investment products - Debt investments - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 6,848 | $ 34,781
Purchases | 2,466 | 7,122
Sales | (7,310) | (13,895)
Amortization | (13) | 19
Change in unrealized gains (losses), net | 235 | 1,993
Realized gains (loss), net | (94) | 562
Transfers to Level 2 | (52,875) | (33,873)
Transfers from Level 2 | 91,165 | 10,139
Balance at end of period | $ 40,422 | $ 6,848

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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