Consolidation - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Cash equivalents	$ 164,878	$ 197,240
Total assets measured at fair value	307,719	307,226
Liabilities
Total liabilities measured at fair value	34,408	56,200
Level 1
Assets
Cash equivalents	164,878	197,240
Total assets measured at fair value	282,060	307,226
Liabilities
Total liabilities measured at fair value	0	0
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	1,216	0
Liabilities
Total liabilities measured at fair value	0	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	24,443	0
Liabilities
Total liabilities measured at fair value	34,408	56,200
Fair Value, Measurements, Recurring | Consolidated Investment Products
Assets
Cash equivalents	113,951	98,101
Derivatives	242
Total assets measured at fair value	2,189,603	2,180,814
Liabilities
Notes payable	1,940,085	1,922,243
Short sales	415	518
Derivatives	83
Total liabilities measured at fair value	1,940,583	1,922,761
Fair Value, Measurements, Recurring | Debt investments | Consolidated Investment Products
Assets
Investments	2,052,148	2,049,617
Fair Value, Measurements, Recurring | Equity investments | Consolidated Investment Products
Assets
Investments	23,262	33,096
Fair Value, Measurements, Recurring | Level 1 | Consolidated Investment Products
Assets
Cash equivalents	113,951	98,101
Derivatives	242
Total assets measured at fair value	135,602	130,984
Liabilities
Notes payable	0	0
Short sales	415	518
Derivatives	83
Total liabilities measured at fair value	498	518
Fair Value, Measurements, Recurring | Level 1 | Debt investments | Consolidated Investment Products
Assets
Investments	427	241
Fair Value, Measurements, Recurring | Level 1 | Equity investments | Consolidated Investment Products
Assets
Investments	20,982	32,642
Fair Value, Measurements, Recurring | Level 2 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Derivatives	0
Total assets measured at fair value	1,998,163	2,012,768
Liabilities
Notes payable	1,940,085	1,922,243
Short sales	0	0
Derivatives	0
Total liabilities measured at fair value	1,940,085	1,922,243
Fair Value, Measurements, Recurring | Level 2 | Debt investments | Consolidated Investment Products
Assets
Investments	1,998,089	2,012,760
Fair Value, Measurements, Recurring | Level 2 | Equity investments | Consolidated Investment Products
Assets
Investments	74	8
Fair Value, Measurements, Recurring | Level 3 | Consolidated Investment Products
Assets
Cash equivalents	0	0
Derivatives	0
Total assets measured at fair value	55,838	37,062
Liabilities
Notes payable	0	0
Short sales	0	0
Derivatives	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring | Level 3 | Debt investments | Consolidated Investment Products
Assets
Investments	53,632	36,616
Fair Value, Measurements, Recurring | Level 3 | Equity investments | Consolidated Investment Products
Assets
Investments	$ 2,206	$ 446