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Loans Receivable - Summary of Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	$ 954,748
Allowance for credit losses on real estate loans receivable	(224,146)	$ (224,036)	$ (80,571)	$ (68,372)
Real estate loans receivable, net of credit allowance	487,674	443,372
Non-real estate loans	458,391	455,508
Allowance for credit losses on non-real estate loans receivable	(215,463)	(215,239)
Non-real estate loans receivable, net of credit allowance	242,928	240,269
Total loans receivable, net of credit allowance	730,602	683,641
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	338,291	299,430
Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	158,066	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	$ (8,683)	$ (8,797)