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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, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Balance at beginning of period | $ 34,781 | $ 25
Purchases | 7,122 | 3,174
Sales | (13,895) | (3,357)
Paydowns | 0 | 0
Amortization | 19 | 9
Change in unrealized gains (losses), net | 1,993 | 434
Realized gains (loss), net | 562 | (49)
Acquired in business combination | 0 | 9,151
Transfers to Level 2 | (33,873) | (35,258)
Transfers from Level 2 | 10,139 | 60,652
Balance at end of period | $ 6,848 | $ 34,781

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