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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Number of non accrual loans | loan	1	1
Commercial Portfolio Segment
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	$ 240,583	$ 582,962
Commercial Portfolio Segment | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	206,878	485,655
Loan on non-accrual status	58,800
Commercial Portfolio Segment | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	21,457	85,667
Commercial Portfolio Segment | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	12,248	$ 11,640
Commercial Portfolio Segment | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	48,503
2018	166,235
2017	0
Prior to 2017	15,529
Total	230,267
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	144,778
2017	0
Prior to 2017	3,281
Total	148,059
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	11,900
2017	0
Prior to 2017	0
Total	11,900
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	109,137
2017	0
Prior to 2017	3,281
Total	112,418
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	23,741
2017	0
Prior to 2017	0
Total	23,741
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	21,457
2017	0
Prior to 2017	0
Total	21,457
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	3,516
2017	0
Prior to 2017	0
Total	3,516
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	17,941
2017	0
Prior to 2017	0
Total	17,941
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/Partnership loans | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	12,248
Total	12,248
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	12,248
Total	12,248
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	48,503
2018	0
2017	0
Prior to 2017	0
Total	48,503
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	48,503
2018	0
2017	0
Prior to 2017	0
Total	48,503
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	$ 0

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