Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Publisher SEC
-Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 948
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column H
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Name Accounting Standards Codification
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Amount of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, written down.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 310
-Section S99
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Number of Loans Held-for-sale

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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) mortgage_note	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount of Mortgages	$ 10,164	$ 20,294	$ 22,764	$ 24,238
Valuation Allowance	700
Conventional Mortgage Loan [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	9,947
Carrying Amount of Mortgages	10,164
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Conventional Mortgage Loan [Member] \| Evansville, IN [Member] \| CVS Caremark Corporation [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.22%
Face Amount of Mortgages	$ 2,465
Carrying Amount of Mortgages	2,505
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Conventional Mortgage Loan [Member] \| Greensboro, GA [Member] \| CVS Caremark Corporation [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.52%
Face Amount of Mortgages	$ 899
Carrying Amount of Mortgages	920
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Conventional Mortgage Loan [Member] \| Shelby Twp., MI [Member] \| CVS Caremark Corporation [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.98%
Face Amount of Mortgages	$ 1,828
Carrying Amount of Mortgages	1,841
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Conventional Mortgage Loan [Member] \| Dallas, TX [Member] \| Walgreen Co. [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.46%
Face Amount of Mortgages	$ 2,254
Carrying Amount of Mortgages	2,297
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Conventional Mortgage Loan [Member] \| Nacogdoches, TX [Member] \| Walgreen Co. [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.80%
Face Amount of Mortgages	$ 2,501
Carrying Amount of Mortgages	2,601
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Mortgage notes receivable [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of mortgage notes receivable \| mortgage_note	5