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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Details) - Debt investments - Consolidated Investment Products - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 54,182 | $ 40,422
Realized gains (losses), net | 40 | 4
Change in unrealized gains (losses), net | 1,836 | (643)
Purchases | 28 | 119
Amortization | 61 | 6
Sales | (9,040) | (1,193)
Transfers to Level 2 | (35,985) | (38,013)
Transfers from Level 2 | 16,444 | 588
Balance at end of period | $ 27,566 | $ 1,290

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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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