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ACQUISITIONS AND DISPOSITIONS - Dispositions (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
property
Jun. 30, 2019
USD ($)
property
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale Price   $ 7,300   $ 7,300
Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of properties sold | property 1      
Sale Price $ 1,300 10,304 $ 1,300 10,304
Book Value and Sales Cost 1,490 $ 9,846 1,490 9,846
Gain/(Loss)     (190) 458
Disposed of by Sale | Unimproved Land        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of properties sold | property   1    
Sale Price 1,300 $ 3,774 1,300 3,774
Book Value and Sales Cost   3,798   3,798
Gain/(Loss)       (24)
Disposed of by Sale | Unimproved Land | Rapid City Land - Rapid City, SD        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale Price 1,300   1,300  
Book Value and Sales Cost $ 1,490   1,490  
Gain/(Loss)     $ (190)  
Disposed of by Sale | Unimproved Land | Creekside Crossing - Bismarck, ND        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale Price   3,049   3,049
Book Value and Sales Cost   3,205   3,205
Gain/(Loss)       (156)
Disposed of by Sale | Unimproved Land | Minot 1525 24th Ave SW - Minot, ND        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale Price   725   725
Book Value and Sales Cost   $ 593   593
Gain/(Loss)       132
Disposed of by Sale | Commercial Property        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of properties sold | property   1    
Disposed of by Sale | Other | Minot 3100 10th St SW - Minot, ND        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale Price   $ 6,530   6,530
Book Value and Sales Cost   $ 6,048   6,048
Gain/(Loss)       $ 482