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ACQUISITIONS AND DISPOSITIONS - Property Dispositions (Details)
$ in Thousands
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2020
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Sep. 30, 2020
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Jun. 30, 2020
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Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
unit
Sep. 30, 2019
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Jun. 30, 2019
USD ($)
Mar. 31, 2019
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Dec. 31, 2018
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Dec. 31, 2020
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property
unit
Dec. 31, 2019
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unit
Dec. 31, 2018
USD ($)
Apr. 30, 2018
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales price $ 45,540 $ 44,138 $ 43,910 $ 44,406 $ 45,777 $ 47,436 $ 46,934 $ 45,608 $ 121,871 $ 177,994 $ 185,755 $ 121,871 $ 169,745
Disposed of by Sale                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price 44,300       203,093         44,300 203,093    
Book Value and Sale Cost 18,828       105,866         18,828 105,866    
Gain/(Loss)                   $ 25,472 97,227    
Retail Site | 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      
MultiFamily Same-Store | Disposed of by Sale                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of properties sold | property                   4      
Sales Price 42,500       186,424         $ 42,500 186,424    
Book Value and Sale Cost $ 16,864       $ 91,514         16,864 91,514    
Gain/(Loss)                   $ 25,636 $ 94,910    
MultiFamily Same-Store | Disposed of by Sale | Forest Park - Grand Forks, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit 268                 268      
Sales Price $ 19,625                 $ 19,625      
Book Value and Sale Cost $ 6,884                 6,884      
Gain/(Loss)                   $ 12,741      
MultiFamily Same-Store | Disposed of by Sale | Landmark, Grand Forks, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit 90                 90      
Sales Price $ 3,725                 $ 3,725      
Book Value and Sale Cost $ 1,348                 1,348      
Gain/(Loss)                   $ 2,377      
MultiFamily Same-Store | Disposed of by Sale | Southwind, Grand Forks, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit 164                 164      
Sales Price $ 10,850                 $ 10,850      
Book Value and Sale Cost $ 4,573                 4,573      
Gain/(Loss)                   $ 6,277      
MultiFamily Same-Store | Disposed of by Sale | Valley Park - Grand Forks, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit 168                 168      
Sales Price $ 8,300                 $ 8,300      
Book Value and Sale Cost 4,059                 4,059      
Gain/(Loss)                   $ 4,241      
MultiFamily Same-Store | Disposed of by Sale | Pinehurst - Billings, Montana                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         21           21    
Sales Price         $ 1,675           $ 1,675    
Book Value and Sale Cost         $ 961           961    
Gain/(Loss)                     $ 714    
MultiFamily Same-Store | Disposed of by Sale | Brookfield Village - Topeka, Kansas                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         160           160    
Sales Price         $ 10,350           $ 10,350    
Book Value and Sale Cost         $ 5,853           5,853    
Gain/(Loss)                     $ 4,497    
MultiFamily Same-Store | Disposed of by Sale | Crown Colony - Topeka, Kansas                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         220           220    
Sales Price         $ 17,200           $ 17,200    
Book Value and Sale Cost         $ 7,876           7,876    
Gain/(Loss)                     $ 9,324    
MultiFamily Same-Store | Disposed of by Sale | Mariposa - Topeka, Kansas                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         54           54    
Sales Price         $ 6,100           $ 6,100    
Book Value and Sale Cost         $ 4,290           4,290    
Gain/(Loss)                     $ 1,810    
MultiFamily Same-Store | Disposed of by Sale | Sherwood - Topeka, Kansas                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         300           300    
Sales Price         $ 26,150           $ 26,150    
Book Value and Sale Cost         $ 11,536           11,536    
Gain/(Loss)                     $ 14,614    
MultiFamily Same-Store | Disposed of by Sale | Villa West - Topeka, Kansas                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         308           308    
Sales Price         $ 22,950           $ 22,950    
Book Value and Sale Cost         $ 15,165           15,165    
Gain/(Loss)                     $ 7,785    
MultiFamily Same-Store | Disposed of by Sale | Crestview - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         152           152    
Sales Price         $ 8,250           $ 8,250    
Book Value and Sale Cost         $ 2,681           2,681    
Gain/(Loss)                     $ 5,569    
MultiFamily Same-Store | Disposed of by Sale | North Pointe - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         73           73    
Sales Price         $ 5,225           $ 5,225    
Book Value and Sale Cost         $ 3,179           3,179    
Gain/(Loss)                     $ 2,046    
MultiFamily Same-Store | Disposed of by Sale | Kirkwood Manor - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         108           108    
Sales Price         $ 5,400           $ 5,400    
Book Value and Sale Cost         $ 2,518           2,518    
Gain/(Loss)                     $ 2,882    
MultiFamily Same-Store | Disposed of by Sale | Westwood Park - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         65           65    
Sales Price         $ 4,250           $ 4,250    
Book Value and Sale Cost         $ 1,931           1,931    
Gain/(Loss)                     $ 2,319    
MultiFamily Same-Store | Disposed of by Sale | Pebble Springs - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         16           16    
Sales Price         $ 875           $ 875    
Book Value and Sale Cost         $ 573           573    
Gain/(Loss)                     $ 302    
MultiFamily Same-Store | Disposed of by Sale | Arbors - S Sioux City, NE                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         192           192    
Sales Price         $ 16,200           $ 16,200    
Book Value and Sale Cost         $ 6,110           6,110    
Gain/(Loss)                     $ 10,090    
MultiFamily Same-Store | Disposed of by Sale | Indian Hills - Sioux City, IA                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         120           120    
Sales Price         $ 8,100           $ 8,100    
Book Value and Sale Cost         $ 5,302           5,302    
Gain/(Loss)                     $ 2,798    
MultiFamily Same-Store | Disposed of by Sale | Ridge Oaks - Sioux City, IA                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         132           132    
Sales Price         $ 7,700           $ 7,700    
Book Value and Sale Cost         $ 4,006           4,006    
Gain/(Loss)                     $ 3,694    
MultiFamily Same-Store | Disposed of by Sale | Cottage West Twin Homes - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         50           50    
Sales Price         $ 6,991           $ 6,991    
Book Value and Sale Cost         $ 4,391           4,391    
Gain/(Loss)                     $ 2,600    
MultiFamily Same-Store | Disposed of by Sale | Gables Townhomes - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         24           24    
Sales Price         $ 2,515           $ 2,515    
Book Value and Sale Cost         $ 2,052           2,052    
Gain/(Loss)                     $ 463    
MultiFamily Same-Store | Disposed of by Sale | Oakmont Estates - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         79           79    
Sales Price         $ 7,010           $ 7,010    
Book Value and Sale Cost         $ 3,917           3,917    
Gain/(Loss)                     $ 3,093    
MultiFamily Same-Store | Disposed of by Sale | Oakwood Estates - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         160           160    
Sales Price         $ 12,090           $ 12,090    
Book Value and Sale Cost         $ 3,056           3,056    
Gain/(Loss)                     $ 9,034    
MultiFamily Same-Store | Disposed of by Sale | Oxbow Park - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         120           120    
Sales Price         $ 10,452           $ 10,452    
Book Value and Sale Cost         $ 2,713           2,713    
Gain/(Loss)                     $ 7,739    
MultiFamily Same-Store | Disposed of by Sale | Prairie Winds - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         48           48    
Sales Price         $ 3,763           $ 3,763    
Book Value and Sale Cost         $ 1,112           1,112    
Gain/(Loss)                     $ 2,651    
MultiFamily Same-Store | Disposed of by Sale | Sierra Vista - Sioux Falls, SD                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Number of apartment homes | unit         44           44    
Sales Price         $ 3,178           $ 3,178    
Book Value and Sale Cost         2,292           2,292    
Gain/(Loss)                     886    
Unimproved Land | 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      
Sales Price         4,374           4,374    
Book Value and Sale Cost         4,225           4,225    
Gain/(Loss)                     149    
Unimproved Land | Disposed of by Sale | Rapid City, South Dakota                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price 1,300                 $ 1,300      
Book Value and Sale Cost 1,490                 1,490      
Gain/(Loss)                   (190)      
Unimproved Land | Disposed of by Sale | Creekside Crossing - Bismarck, ND                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price         3,049           3,049    
Book Value and Sale Cost         3,205           3,205    
Gain/(Loss)                     (156)    
Unimproved Land | Disposed of by Sale | Minot, North Dakota                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price         725           725    
Book Value and Sale Cost         593           593    
Gain/(Loss)                     132    
Unimproved Land | Disposed of by Sale | Weston - Weston, Wisconsin                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price         600           600    
Book Value and Sale Cost         427           427    
Gain/(Loss)                     173    
Other Property | Disposed of by Sale                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price 12,295                 12,295      
Book Value and Sale Cost         10,127           10,127    
Gain/(Loss)                     2,168    
Other Property | Disposed of by Sale | Dakota West                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price 500                 500      
Book Value and Sale Cost 474                 474      
Gain/(Loss)                   26      
Other Property | Disposed of by Sale | Minot, North Dakota                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price         6,530           6,530    
Book Value and Sale Cost         6,048           6,048    
Gain/(Loss)                     482    
Other Property | Disposed of by Sale | Woodbury 1865 Woodlane - Woodbury, MN                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Sales Price $ 5,765                 $ 5,765      
Book Value and Sale Cost         $ 4,079           4,079    
Gain/(Loss)                     $ 1,686