Consolidated Company-Sponsored Investment Funds - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 4,402	$ 5,887
Derivatives	18,940	18,342
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	22,082	15,422
Derivatives	16,147	16,923
Total liabilities measured at fair value	58,893	59,011
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	133,734	155,904
Derivative Assets	1,564	392
Total assets measured at fair value	257,880	307,452
Derivatives	1,895	1,186
Total liabilities measured at fair value	5,543	5,014
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	28,052	39,284
Derivative Assets	20,518	15,030
Total assets measured at fair value	1,741,106	1,558,142
Derivatives	14,252	15,737
Total liabilities measured at fair value	14,252	15,737
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	119	126
Derivative Assets	0	0
Total assets measured at fair value	119	126
Derivatives	0	0
Total liabilities measured at fair value	39,098	38,260
Recurring | Company-sponsored investment funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	491,328	618,912
Total liabilities measured at fair value	18,940	18,342
Recurring | Company-sponsored investment funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	86,519	166,037
Total liabilities measured at fair value	16,013	16,291
Recurring | Company-sponsored investment funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	404,561	449,518
Total liabilities measured at fair value	2,927	2,051
Recurring | Company-sponsored investment funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	248	3,357
Total liabilities measured at fair value	0	0
Recurring | VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	486,926	613,025
Derivative Assets	4,402	5,887
Derivatives	18,940	18,342
Recurring | VIEs | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	84,737	165,415
Derivative Assets	1,782	622
Derivatives	16,013	16,291
Recurring | VIEs | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	401,941	444,253
Derivative Assets	2,620	5,265
Derivatives	2,927	2,051
Recurring | VIEs | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	248	3,357
Derivative Assets	0	0
Derivatives	$ 0	$ 0