Loans Receivable - Summary of Real Estate Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	$ 1,463,095
Allowance for credit losses on real estate loans receivable	(167,432)	$ (224,036)		$ (81,985)	$ (68,372)
Real estate loans receivable, net of credit allowance	1,097,299	443,372	[1]
Non-real estate loans	348,061	455,508
Allowance for credit losses on non-real estate loans receivable	(149,697)	(215,239)
Non-real estate loans receivable, net of credit allowance	198,364	240,269
Total loans receivable, net of credit allowance	1,295,663	683,641
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	935,572	299,430
Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Carrying Value	179,462	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	$ (17,735)	$ (8,797)

[1] Note: The consolidated balance sheet at December 31, 2020 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.