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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	Jun. 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	$ 292,058	$ 582,962
Commercial Portfolio Segment | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	241,293	485,655
Loan on non-accrual status	56,600
Commercial Portfolio Segment | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	38,723	85,667
Commercial Portfolio Segment | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	12,042	$ 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	41,328
2020	0
2019	48,286
2018	178,578
2017	0
Prior to 2017	15,542
Total	283,734
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	34,394
2020	0
2019	0
2018	146,789
2017	0
Prior to 2017	3,500
Total	184,683
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	0
2017	0
Prior to 2017	0
Total	0
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	34,394
2020	0
2019	0
2018	118,045
2017	0
Prior to 2017	3,500
Total	155,939
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	28,744
2017	0
Prior to 2017	0
Total	28,744
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	6,934
2020	0
2019	0
2018	31,789
2017	0
Prior to 2017	0
Total	38,723
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	0
2017	0
Prior to 2017	0
Total	0
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	13,115
2017	0
Prior to 2017	0
Total	13,115
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	6,934
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	6,934
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	18,674
2017	0
Prior to 2017	0
Total	18,674
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	12,042
Total	12,042
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	12,042
Total	12,042
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 (refer to Note 5)
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	48,286
2018	0
2017	0
Prior to 2017	0
Total	48,286
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables (refer to Note 5) | 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 (refer to Note 5) | 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 (refer to Note 5) | 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	48,286
2018	0
2017	0
Prior to 2017	0
Total	48,286
Commercial Portfolio Segment | Performing Financial Instruments | Financing receivables (refer to Note 5) | 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 (refer to Note 5) | 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 (refer to Note 5) | 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 (refer to Note 5) | 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 (refer to Note 5) | 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 (refer to Note 5) | 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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