Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Recorded investment in loans, aged by payment status and presented by class
Total	$ 212,683	$ 582,962
Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	59,640	85,447
Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	59,640	0
Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	85,447
Current
Recorded investment in loans, aged by payment status and presented by class
Total	153,043	497,515
Senior mortgages
Recorded investment in loans, aged by payment status and presented by class
Total	199,608	485,655
Senior mortgages | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	59,640	42,501
Senior mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	59,640	0
Senior mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	42,501
Senior mortgages | Current
Recorded investment in loans, aged by payment status and presented by class
Total	139,968	443,154
Corporate/Partnership loans
Recorded investment in loans, aged by payment status and presented by class
Total	618	85,667
Corporate/Partnership loans | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	0	42,946
Corporate/Partnership loans | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Corporate/Partnership loans | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	42,946
Corporate/Partnership loans | Current
Recorded investment in loans, aged by payment status and presented by class
Total	618	42,721
Subordinate mortgages
Recorded investment in loans, aged by payment status and presented by class
Total	12,457	11,640
Subordinate mortgages | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Current
Recorded investment in loans, aged by payment status and presented by class
Total	$ 12,457	$ 11,640