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Loans Receivable - Summary of Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	$ 1,493,269
Allowance for credit losses on real estate loans receivable	(166,802)	$ (224,036)	$ (84,895)	$ (68,372)
Real estate loans receivable, net of credit allowance	1,115,645	443,372
Non-real estate loans	362,077	455,508
Allowance for credit losses on non-real estate loans receivable	(151,255)	(215,239)
Non-real estate loans receivable, net of credit allowance	210,822	240,269
Total loans receivable, net of credit allowance	1,326,467	683,641
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	957,114	299,430
Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	174,078	152,739
Allowance for credit losses on real estate loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on real estate loans receivable	$ (15,547)	$ (8,797)