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Loans Receivable - Summary of Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	$ 881,750
Allowance for credit losses on real estate loans receivable	(84,895)	$ (68,372)	$ (68,372)	$ (68,372)
Real estate loans receivable, net of credit allowance	414,706	270,382
Non-real estate loans	460,411	362,850
Allowance for credit losses on non-real estate loans receivable	(78,262)	(25,996)
Non-real estate loans receivable, net of credit allowance	382,149	336,854
Total loans receivable, net of credit allowance	796,855	607,236
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	293,351	188,062
Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	127,988	124,696
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	$ (6,633)	$ (42,376)