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Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 729,646	$ 703,280
Other lending investments	154,453	153,216
Total gross carrying value of loans receivable and other lending investments	884,099	856,495
Allowance for loan losses	(33,264)	(28,634)
Total loans receivable and other lending investments, net	850,835	827,861
Financing receivables (refer to Note 5)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	44,445	44,339
Held-to-maturity debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	86,368	84,981
Available-for-sale debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	23,640	23,896
Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	595,560	572,585
Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	123,023	119,818
Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	11,063	10,877
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	641,943	614,386
Allowance for loan losses	(9,724)	(6,668)
Construction loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	542,241	518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	99,702	95,394
Construction loans | Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	641,943	614,386
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	87,703	88,893
Allowance for loan losses	(686)	(265)
Loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	53,319	53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	23,321	24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 11,063	$ 10,877

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