Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash equivalents	$ 135,115	$ 158,596
Total assets measured at fair value	196,318	226,606
Level 1
Assets
Cash equivalents	135,115	158,596
Total assets measured at fair value	196,307	222,484
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	11	0
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	4,122
Consolidated Investment Products \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	84,170	51,363
Total assets measured at fair value	2,047,646	1,800,931
Liabilities
Notes payable	1,831,129	1,620,260
Short sales	382	707
Total liabilities measured at fair value	1,831,511	1,620,967
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Debt investments
Assets
Investments	1,947,278	1,736,868
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Equity investments
Assets
Investments	16,198	12,700
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1
Assets
Cash equivalents	84,170	51,363
Total assets measured at fair value	99,928	69,369
Liabilities
Notes payable	0	0
Short sales	382	707
Total liabilities measured at fair value	382	707
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Debt investments
Assets
Investments	123	5,306
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 1 \| Equity investments
Assets
Investments	15,635	12,700
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	1,922,580	1,724,714
Liabilities
Notes payable	1,831,129	1,620,260
Short sales	0	0
Total liabilities measured at fair value	1,831,129	1,620,260
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Debt investments
Assets
Investments	1,922,574	1,724,714
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 2 \| Equity investments
Assets
Investments	6	0
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	25,138	6,848
Liabilities
Notes payable	0	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	24,581	6,848
Consolidated Investment Products \| Fair Value, Measurements, Recurring \| Level 3 \| Equity investments
Assets
Investments	$ 557	$ 0

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
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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
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-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
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