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Loans Receivable (Summary of Net Loans Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on real estate loans receivable	$ (224,036)	$ (68,372)	$ (68,372)	$ (68,372)
Real estate loans receivable, net of credit allowance	443,372	270,382
Non-real estate loans	455,508	362,850
Allowance for credit losses on non-real estate loans receivable	(215,239)	(25,996)
Non real estate loans receivable, net of allowance	240,269	336,854
Total loans receivable, net of credit allowance	683,641	607,236
Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loans receivable, gross	299,430	188,062
Other real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loans receivable, gross	152,739	124,696
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on real estate loans receivable	$ (8,797)	$ (42,376)