REAL ESTATE HELD FOR SALE (Revenue and Expenses of Real Estate Held-for-Sale) (Details) - Disposed of by Sale - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Revenues
Rental income	$ 702	$ 2,820
Tenant reimbursements	194	583
Total revenues	896	3,403
Expenses
Operating, maintenance, and management	39	529
Real estate taxes and insurance	147	480
Asset management fees to affiliate	82	253
General and administrative expenses	(2)	56
Depreciation and amortization	389	849
Interest expense	191	397
Total expenses	$ 846	$ 2,564

Disposal Group, Including Discontinued Operation, Asset Management Costs

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Disposal Group, Including Discontinued Operation, Costs and Expenses

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Disposal Group, Including Discontinued Operation, Real Estate Taxes and Insurance

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Disposal Group, Including Discontinued Operation, Tenant Reimbursements

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Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677

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-Name Accounting Standards Codification
-Topic 205
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-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1060-107759

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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of rental income attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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