Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash equivalents	$ 207,101	$ 187,255
Total assets measured at fair value	257,703	256,969
Level 1
Assets
Cash equivalents	207,101	187,255
Total assets measured at fair value	257,700	256,953
Level 2
Assets
Cash equivalents	0	0
Total assets measured at fair value	3	16
Level 3
Assets
Cash equivalents	0	0
Total assets measured at fair value	0	0
Fair Value, Measurements, Recurring \| CIP
Assets
Cash equivalents	82,295	97,130
Derivatives	2,085
Total assets measured at fair value	2,416,944	2,127,240
Liabilities
Notes payable	2,190,445	1,834,535
Derivatives	1,471
Short sales	520	430
Total liabilities measured at fair value	2,192,436	1,834,965
Fair Value, Measurements, Recurring \| Debt investments \| CIP
Assets
Investments	2,289,426	2,013,034
Fair Value, Measurements, Recurring \| Equity investments \| CIP
Assets
Investments	43,138	17,076
Fair Value, Measurements, Recurring \| Level 1 \| CIP
Assets
Cash equivalents	82,295	97,130
Derivatives	858
Total assets measured at fair value	138,480	113,220
Liabilities
Notes payable	0	0
Derivatives	714
Short sales	520	430
Total liabilities measured at fair value	1,234	430
Fair Value, Measurements, Recurring \| Level 1 \| Debt investments \| CIP
Assets
Investments	16,859	218
Fair Value, Measurements, Recurring \| Level 1 \| Equity investments \| CIP
Assets
Investments	38,468	15,872
Fair Value, Measurements, Recurring \| Level 2 \| CIP
Assets
Cash equivalents	0	0
Derivatives	1,227
Total assets measured at fair value	2,224,282	1,973,598
Liabilities
Notes payable	2,190,445	1,834,535
Derivatives	757
Short sales	0	0
Total liabilities measured at fair value	2,191,202	1,834,535
Fair Value, Measurements, Recurring \| Level 2 \| Debt investments \| CIP
Assets
Investments	2,219,199	1,973,427
Fair Value, Measurements, Recurring \| Level 2 \| Equity investments \| CIP
Assets
Investments	3,856	171
Fair Value, Measurements, Recurring \| Level 3 \| CIP
Assets
Cash equivalents	0	0
Derivatives	0
Total assets measured at fair value	54,182	40,422
Liabilities
Notes payable	0	0
Derivatives	0
Short sales	0	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Level 3 \| Debt investments \| CIP
Assets
Investments	53,368	39,389
Fair Value, Measurements, Recurring \| Level 3 \| Equity investments \| CIP
Assets
Investments	$ 814	$ 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 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, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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