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Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020
Carrying Value
Book and estimated fair values of financial instruments
Net investment in leases	$ 478		$ 429
Loans receivable and other lending investments	455		732
Cash and cash equivalents	155		99
Restricted cash	53		52
Loan participations payable, net	0		43
Debt obligations, net	3,289		3,287
Fair Value
Book and estimated fair values of financial instruments
Net investment in leases	491		431
Loans receivable and other lending investments	488		772
Cash and cash equivalents	155		99
Restricted cash	53		52
Loan participations payable, net	0		43
Debt obligations, net	$ 3,543		3,414
3.125% Senior Convertible Notes
Book and estimated fair values of financial instruments
Stated interest rates	3.125%			3.125%
3.125% Senior Convertible Notes | Unsecured notes
Book and estimated fair values of financial instruments
Debt obligations, net	$ 435,900		$ 338,800
Stated interest rates	3.125%	3.125%	3.125%	3.125%	3.125%

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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
-Paragraph 10
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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
-Topic 210
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Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

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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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-Publisher FASB
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