Investments in Debt Securities and Notes Receivable - Additional Information (Details) $ in Thousands	1 Months Ended		2 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($) shares	Jul. 31, 2020 USD ($)	Feb. 26, 2021 USD ($)	Dec. 31, 2020 USD ($) extension_option	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 300,000			$ 300,000	$ 0	$ 0
Debt securities, term				5 years
Debt securities, extension option | extension_option				2
Debt securities, extension term				1 year
Debt securities, period after which preferred dividends increase annually				5 years
Bridge loans, extension option | extension_option				2
Bridge loans, extension term				1 year
Proceeds from sale of notes receivable				$ 62,764	0	0
Payments to purchase notes receivable				$ 313,355	$ 185,993	$ 13,850
Notes Receivable-Bridge Loans
Schedule of Held-to-maturity Securities [Line Items]
Bridge loans, original maturities				3 years
Principal amount of notes sold				$ 63,088
Proceeds from sale of notes receivable				$ 62,764
Notes Receivable-Bridge Loans | Subsequent Event
Schedule of Held-to-maturity Securities [Line Items]
Principal amount of notes sold			$ 76,241
Proceeds from sale of notes receivable			$ 75,707
Notes Receivable-Senior Mezzanine Loan
Schedule of Held-to-maturity Securities [Line Items]
Purchase of note receivable		$ 103,000
Note receivable interest rate		5.50%
Payments to purchase notes receivable		$ 101,142
JCAP Series A Preferred Stock
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 200,000
Investment in debt securities (in shares) | shares	200,000
Debt securities, dividend rate				10.00%
JCAP Series B Preferred Stock
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 100,000
Investment in debt securities (in shares) | shares	100,000
Debt securities, dividend rate				12.00%