Schedule IV (Consolidated) - Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Mortgage Loans on Real Estate [Line Items]
Carrying Amount of Mortgages	$ 2,995
Annual principal payment	$ 100
Amortization period	20 years
Interest Bearing - 5.5% interest rate due November 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Interest Bearing - 5.5% interest rate due November 2019 \| Seller financing \| Seller Financing, Maturing November 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Carrying Amount of Mortgages	$ 1,060
Interest Bearing - 5.5% interest rate due September 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Interest Bearing - 5.5% interest rate due September 2019 \| Seller financing \| Seller Financing, Maturing September 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Carrying Amount of Mortgages	$ 904
Interest Bearing - 5.5% interest rate due June 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Interest Bearing - 5.5% interest rate due June 2019 \| Seller financing \| Seller Financing, Maturing June 2019
Mortgage Loans on Real Estate [Line Items]
Interest rate	5.50%
Carrying Amount of Mortgages	$ 857
Various other seller financing \| Various other seller financing \| Various other seller financing maturing October 2022 through November 2023
Mortgage Loans on Real Estate [Line Items]
Carrying Amount of Mortgages	$ 174
Various other seller financing \| Minimum \| Various other seller financing \| Various other seller financing maturing October 2022 through November 2023
Mortgage Loans on Real Estate [Line Items]
Interest rate	4.80%
Various other seller financing \| Maximum \| Various other seller financing \| Various other seller financing maturing October 2022 through November 2023
Mortgage Loans on Real Estate [Line Items]
Interest rate	8.15%

Mortgage Loans On Real Estate, Amortization Period

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Mortgage Loans On Real Estate, Annual Principal Payment

+ References

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- Definition

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

+ 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)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

+ 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

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-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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