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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Recorded investment in loans, aged by payment status and presented by class
Current	$ 181,764	$ 497,515
Total Past Due	58,819	85,447
Total	240,583	582,962
Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	0	85,447
Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	58,819	0
Senior mortgages
Recorded investment in loans, aged by payment status and presented by class
Current	148,059	443,154
Total Past Due	58,819	42,501
Total	206,878	485,655
Senior mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	0	42,501
Senior mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	58,819	0
Corporate/Partnership loans
Recorded investment in loans, aged by payment status and presented by class
Current	21,457	42,721
Total Past Due	0	42,946
Total	21,457	85,667
Corporate/Partnership loans | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	0	42,946
Corporate/Partnership loans | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	0	0
Subordinate mortgages
Recorded investment in loans, aged by payment status and presented by class
Current	12,248	11,640
Total Past Due	0	0
Total	12,248	11,640
Subordinate mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	0	0
Subordinate mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total Past Due	$ 0	$ 0

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- Definition

Amount of financing receivable not past due.

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