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SALES OF PROPERTIES (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
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Dec. 13, 2018 | Sep. 14, 2018 | Jan. 30, 2018 | Nov. 14, 2017 | Aug. 31, 2017 | Jul. 14, 2017 | May 08, 2017 | Dec. 22, 2016 | Jul. 05, 2016 | Jun. 30, 2016 | Jun. 15, 2016 | May 19, 2016 | Feb. 01, 2016 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2017
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 153,000 |  |
Joe's Crab Shack restaurant Ann Arbor, Michigan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 153,000 |  |  |  |
Sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,659,000 | 27,050,000 | $ 43,363,000 |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,262,000 | $ 9,837,000 | 10,087,000 |
Sale of real estate | Retail Property, Fort Bend, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  | 2,408,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Land, Lakemoor, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 8,459,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  | 4,585,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rental payment received and recorded as deferred income |  | $ 5,717,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,906,000
Sale of real estate | Retail Property, Lincoln Nebraska |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net | $ (1,731,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Retail property, Greenwood Village, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 9,500,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  | $ 6,568,000 |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Retail Property, Kansas City, Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | $ 10,250,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  | $ 2,180,000 |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Retail Property, Niles Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  | $ 1,089,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Restaurant property, Ann Arbor, Michigan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate | Portfolio of eight retail properties, Louisiana and Mississippi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,750,000 |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  | $ 787,000 |  |  |  |  |
Sale of real estate | Retail property, Killeen, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  | $ 980,000 |  |  |  |  |  |
Sale of real estate | Land, Sandy Springs, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | $ 8,858,000 |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | $ 2,331,000 |  |  |  |  |  |  |
Sale of real estate | Industrial property, Tomlinson, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | $ 14,800,000 |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | $ 5,660,000 |  |  |  |  |  |  |  |
Sale of real estate | Retail property, Island Park, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  | $ 2,702,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  | $ 213,000 |  |  |  |  |  |  |  |  |  |
Sale of real estate | Properties excluding Partial condemnation of land, Greenwood Village, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,210,000 |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,971,000 |
Sale of real estate | Partial condemnation of land, Greenwood Village, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | $ 153,000 |  |  |  |  |  |  |  |  |
Gain (loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | $ 116,000 |  |  |  |  |  |  |  |  |
Non-Controlling Interests in Consolidated Joint Ventures | Sale of real estate | Retail Property, Fort Bend, Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  | $ 776,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Joint Venture | Sale of real estate | Retail Property, Fort Bend, Texas | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES OF PROPERTIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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