Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Cash equivalents	$ 138,847	$ 187,255
Total assets measured at fair value	187,397	256,969
Level 1
Assets
Cash equivalents	138,847	187,255
Total assets measured at fair value	187,393	256,953
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	4	16
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Consolidated Investment Products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	72,721	97,130
Derivatives	806
Total assets measured at fair value	2,347,347	2,127,240
Liabilities
Notes payable	2,156,587	1,834,535
Derivatives	806
Short sales	421	430
Total liabilities measured at fair value	2,157,814	1,834,965
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	2,248,078	2,013,034
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Equity investments
Assets
Investments	25,742	17,076
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	72,721	97,130
Derivatives	295
Total assets measured at fair value	113,258	113,220
Liabilities
Notes payable	0	0
Derivatives	495
Short sales	421	430
Total liabilities measured at fair value	916	430
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments	16,040	218
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity investments
Assets
Investments	24,202	15,872
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Derivatives	511
Total assets measured at fair value	2,222,217	1,973,598
Liabilities
Notes payable	2,156,587	1,834,535
Derivatives	311
Short sales	0	0
Total liabilities measured at fair value	2,156,898	1,834,535
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	2,220,486	1,973,427
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity investments
Assets
Investments	1,220	171
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Derivatives	0
Total assets measured at fair value	11,872	40,422
Liabilities
Notes payable	0	0
Derivatives	0
Short sales	0	0
Total liabilities measured at fair value	0	0
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3 \| Debt investments
Assets
Investments	11,552	39,389
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity investments
Assets
Investments	$ 320	$ 1,033

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

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Fair value of obligations incurred from short sales.

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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.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of notes payable.

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