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SALES OF PROPERTIES AND IMPAIRMENT LOSS (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 30, 2018 USD ($) | Jan. 31, 2015 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($)
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  | $ 27,050,000 | $ 43,363,000 |
Gain on Sales of Real Estate, Net |  |  |  |  | 9,837,000 | 10,087,000 |
Total sales price, net of closing costs |  |  |  |  | 26,301,000 | 42,312,000 | $ 16,025,000
Mortgage loan paid off |  |  |  |  | 12,936,000 | 63,726,000 | 27,967,000
Impairment loss |  |  |  |  | 153,000 |  |
Retail property, Greenwood Village, Colorado |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  | 9,500,000 |  |
Gain on Sales of Real Estate, Net |  |  |  |  | 6,568,000 |  |
Retail Property, Kansas City, Missouri |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  | 10,250,000 |  |
Gain on Sales of Real Estate, Net |  |  |  |  | 2,180,000 |  |
Retail Property, Niles Illinois |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  | 5,000,000 |  |
Gain on Sales of Real Estate, Net |  |  |  |  | 1,089,000 |  |
Restaurant property, Ann Arbor, Michigan |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  | $ 2,300,000 |  |
Portfolio of eight retail properties, Louisiana and Mississippi |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 13,750,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | $ 787,000 |
Number of real estate properties sold | property |  |  |  |  |  | 8 |
Retail property, Killeen, Texas |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | $ 3,100,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | 980,000 |
Land, Sandy Springs, Georgia |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 8,858,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | 2,331,000 |
Industrial property, Tomlinson, Pennsylvania |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 14,800,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | 5,660,000 |
Retail property, Island Park, NY |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 2,702,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | 213,000 |
Properties excluding Partial condemnation of land, Greenwood Village, Colorado |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 43,210,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | 9,971,000 |
Partial condemnation of land, Greenwood Village, Colorado |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price |  |  |  |  |  | 153,000 |
Gain on Sales of Real Estate, Net |  |  |  |  |  | $ 116,000 |
Property located in Cherry Hill, NJ | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Gain on Sales of Real Estate, Net |  |  |  |  |  |  | $ 5,392,000
Total sales price, net of closing costs |  | $ 16,025,000 |  |  |  |  |
Mortgage balance paid off |  | 7,376,000 |  |  |  |  |
Swap termination expense |  | 472,000 |  |  |  |  |
Property located in Cherry Hill, NJ | Consolidated JV | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Non-controlling interest's share of the gain from the transaction |  | $ 1,320,000 |  |  |  |  |
Property located in Fort Bend, Texas | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Net Sales price | $ 9,000,000 |  |  |  |  |  |
Gain on Sales of Real Estate, Net |  |  | $ 2,400,000 |  |  |  |
Ownership percentage | 85.00% |  |  |  |  |  |
Mortgage loan paid off | $ 4,400,000 |  |  |  |  |  |
Rental revenue to property accounted percentage |  |  |  |  | 1.20% | 1.20% | 1.20%
Property located in Fort Bend, Texas | Consolidated JV | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Non-controlling interest's share of the gain from the transaction | $ 800,000 |  |  |  |  |  |
Joe's Crab Shack restaurant Ann Arbor, Michigan |  |  |  |  |  |  |
Sale of Properties |  |  |  |  |  |  |
Impairment loss |  |  |  | $ 153,000 |  |  |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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