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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Recorded investment in loans, aged by payment status and presented by class
Current	$ 379,126	$ 497,515
Total Past Due	0	85,447
Total	379,126	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	0	0
Senior mortgages
Recorded investment in loans, aged by payment status and presented by class
Current	327,011	443,154
Total Past Due	0	42,501
Total	327,011	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	0	0
Corporate/Partnership loans
Recorded investment in loans, aged by payment status and presented by class
Current	40,276	42,721
Total Past Due	0	42,946
Total	40,276	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	11,839	11,640
Total Past Due	0	0
Total	11,839	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

X

- Definition

Amount of financing receivable not past due.

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