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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments | $ 0 | $ 17,809,000 | $ 0 | $ 17,809,000
Grand Forks, North Dakota | Apartment Building |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 12,200,000
Grand Forks, North Dakota | Land |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 1,500,000
Bloomington, Minnesota | Industrial Property |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 1,400,000
Woodbury, Minnesota | Industrial Property |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 922,000
Property In Minot ND | Retail Property |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 630,000
Williston, North Dakota | Land |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | 428,000
Bismarck, North Dakota | Land |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Impairment of real estate investments |  |  |  | $ 709,000

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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