Real Estate Loans, Notes Receivable, and Lines of Credit CMBS (Details) $ in Thousands			12 Months Ended
	Mar. 28, 2019 USD ($)	Mar. 23, 2018 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Sale of Mortgage-backed Securities (MBS), Available-for-sale			$ 0	$ 0	$ 79,558
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount			$ 206,300
Mortgage Backed Securities, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Sale of Mortgage-backed Securities (MBS), Available-for-sale	$ 20,400	$ 6,200
number of loans in CMBS trust	21	20
total maturity amount of CMBS pool	$ 295,700	$ 276,300