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Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Sep. 30, 2020
Carrying Value
Book and estimated fair values of financial instruments
Net investment in leases	$ 477		$ 429
Loans receivable and other lending investments	406		732
Cash and cash equivalents	299		99
Restricted cash	56		52
Loan participations payable, net	0		43
Debt obligations, net	3,283		3,287
Fair Value
Book and estimated fair values of financial instruments
Net investment in leases	497		431
Loans receivable and other lending investments	436		772
Cash and cash equivalents	299		99
Restricted cash	56		52
Loan participations payable, net	0		43
Debt obligations, net	$ 3,643		3,414
3.125% Senior Convertible Notes
Book and estimated fair values of financial instruments
Stated interest rate	3.125%			3.125%
3.125% Senior Convertible Notes | Unsecured notes
Book and estimated fair values of financial instruments
Debt obligations, net	$ 527,200		$ 338,800
Stated interest rate	3.125%	3.125%	3.125%	3.125%

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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