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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Details) - Consolidated Investment Products - Debt investments - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 40,422 | $ 6,848
Realized gains (losses), net | 4 | (114)
Change in unrealized gains (losses), net | (920) | 563
Purchases | 56 | 2,157
Amortization | 6 | 0
Sales | (1,195) | (2,457)
Transfers to Level 2 | (38,607) | (21,891)
Transfers from Level 2 | 12,106 | 40,032
Balance at end of period | $ 11,872 | $ 25,138

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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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