Consolidation - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash equivalents	$ 180,574	$ 307,277
Total assets measured at fair value	269,304	400,933
Liabilities
Total liabilities measured at fair value	72,980	88,400
Level 1
Assets
Cash equivalents	180,574	307,277
Total assets measured at fair value	269,304	400,933
Liabilities
Total liabilities measured at fair value	0	0
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	0	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Liabilities
Total liabilities measured at fair value	72,980	88,400
Fair Value, Measurements, Recurring \| Consolidated Investment Products
Assets
Cash equivalents	104,348	205,192
Total assets measured at fair value	2,094,507	2,345,430
Liabilities
Notes payable	1,904,444	2,033,617
Short sales	345	515
Total liabilities measured at fair value	1,904,789	2,034,132
Fair Value, Measurements, Recurring \| Debt investments \| Consolidated Investment Products
Assets
Investments	1,962,901	2,110,704
Fair Value, Measurements, Recurring \| Equity investments \| Consolidated Investment Products
Assets
Investments	27,258	29,534
Fair Value, Measurements, Recurring \| Level 1 \| Consolidated Investment Products
Assets
Cash equivalents	104,348	205,192
Total assets measured at fair value	127,312	231,576
Liabilities
Notes payable	0	0
Short sales	345	515
Total liabilities measured at fair value	345	515
Fair Value, Measurements, Recurring \| Level 1 \| Debt investments \| Consolidated Investment Products
Assets
Investments	197	273
Fair Value, Measurements, Recurring \| Level 1 \| Equity investments \| Consolidated Investment Products
Assets
Investments	22,767	26,111
Fair Value, Measurements, Recurring \| Level 2 \| Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	1,935,438	2,110,697
Liabilities
Notes payable	1,904,444	2,033,617
Short sales	0	0
Total liabilities measured at fair value	1,904,444	2,033,617
Fair Value, Measurements, Recurring \| Level 2 \| Debt investments \| Consolidated Investment Products
Assets
Investments	1,932,308	2,107,736
Fair Value, Measurements, Recurring \| Level 2 \| Equity investments \| Consolidated Investment Products
Assets
Investments	3,130	2,961
Fair Value, Measurements, Recurring \| Level 3 \| Consolidated Investment Products
Assets
Cash equivalents	0	0
Total assets measured at fair value	31,757	3,157
Liabilities
Notes payable	0	0
Short sales	0	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Debt investments \| Consolidated Investment Products
Assets
Investments	30,396	2,695
Fair Value, Measurements, Recurring \| Level 3 \| Equity investments \| Consolidated Investment Products
Assets
Investments	$ 1,361	$ 462

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of obligations incurred from short sales.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Fair value portion of notes payable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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