Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	$ 13,857	$ 14,518
Derivatives	11,859	18,180
Total liabilities measured at fair value	265,967	270,870
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	175,617	121,703
Derivatives - VIEs	47	1
Total assets measured at fair value	331,260	268,610
Derivatives	751	3,511
Total liabilities measured at fair value	751	3,511
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	6,319	32,104
Derivatives - VIEs	13,810	14,517
Total assets measured at fair value	885,382	914,300
Derivatives	11,108	14,669
Total liabilities measured at fair value	11,108	14,669
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	114	118
Total assets measured at fair value	114	118
Total liabilities measured at fair value	254,108	252,690
Company-Sponsored Investment Funds | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	303,826	410,851
Total liabilities measured at fair value	5,366	2,531
Company-Sponsored Investment Funds | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	63,660	60,630
Total liabilities measured at fair value	88	944
Company-Sponsored Investment Funds | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	240,166	350,221
Total liabilities measured at fair value	5,278	1,587
Company-Sponsored Investment Funds | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Total liabilities measured at fair value	0	0
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - VIEs	5,698	4,902
Derivatives	5,366	2,531
VIEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	171,088	286,619
Derivatives - VIEs	5,698	4,902
Derivatives	5,366	2,531
VIEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	46,870	49,455
Derivatives - VIEs	250	2,139
Derivatives	88	944
VIEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	124,218	237,164
Derivatives - VIEs	5,448	2,763
Derivatives	5,278	1,587
VIEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	0	0
Derivatives - VIEs	0	0
Derivatives	0	0
VOEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	127,040	110,555
Derivatives - VIEs		8,775
VOEs | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	16,540	9,036
Derivatives - VIEs		0
VOEs | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	110,500	101,519
Derivatives - VIEs		8,775
VOEs | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments - VIEs	$ 0	0
Derivatives - VIEs		$ 0