Schedule IV - Mortgage Loans on Real Estate (Details) - Conventional Mortgage Loan [Member] $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 22,496
Carrying Amount of Mortgages	20,294
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Mt. Airy, MD [Member] \| Bank of America, N.A. [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.42%
Face Amount of Mortgages	$ 2,418
Carrying Amount of Mortgages	2,618
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Evansville, IN [Member] \| CVS Caremark Corporation [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.22%
Face Amount of Mortgages	$ 2,571
Carrying Amount of Mortgages	2,812
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Greensboro, GA [Member] \| CVS Caremark Corporation [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.52%
Face Amount of Mortgages	$ 952
Carrying Amount of Mortgages	1,053
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Shelby Twp., MI [Member] \| CVS Caremark Corporation [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.98%
Face Amount of Mortgages	$ 1,928
Carrying Amount of Mortgages	2,067
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Framingham, MA [Member] \| Lowes Companies, Inc. [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.87%
Face Amount of Mortgages	$ 5,953
Carrying Amount of Mortgages	2,169
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Dallas, TX [Member] \| Walgreen Co. [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.46%
Face Amount of Mortgages	$ 2,390
Carrying Amount of Mortgages	2,636
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Nacogdoches, TX [Member] \| Walgreen Co. [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.80%
Face Amount of Mortgages	$ 2,633
Carrying Amount of Mortgages	2,953
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Rosemead, CA [Member] \| Walgreen Co. [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.26%
Face Amount of Mortgages	$ 3,651
Carrying Amount of Mortgages	3,986
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0

The carrying amount of the outstanding balance due under the mortgage loan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.10(a))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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