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ACQUISITIONS AND DISPOSITIONS - Property Dispositions (Details)
$ in Thousands
 2 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2019
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Dec. 31, 2019
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Sep. 30, 2019
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Jun. 30, 2019
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Mar. 31, 2019
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Oct. 31, 2018
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Jul. 31, 2018
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Apr. 30, 2018
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apartment_community
Jan. 31, 2018
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Oct. 31, 2017
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Jul. 31, 2017
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Dec. 31, 2018
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Dec. 31, 2019
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Apr. 30, 2018
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apartment_community
Apr. 30, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price $ 30,287 $ 45,777 $ 47,436 $ 46,934 $ 45,608 $ 45,638 $ 45,946 $ 44,185 $ 42,716 $ 41,866 $ 40,978 $ 121,871 $ 185,755 $ 169,745 $ 160,104
Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       63,357 203,093 515,130  
Gain/(Loss)                       9,707 $ 97,227 184,268  
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                         2    
Multi-Family Residential | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       41,500 $ 186,424 18,913  
Gain/(Loss)                       8,453 $ 94,910 3,343  
Number of properties sold | property                         21    
Multi-Family Residential | Disposed of by Sale | 21 homes - Pinehurst - Billings, MT                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 1,675    
Gain/(Loss)                         $ 714    
Number of homes, dispositions | unit 21 21                     21    
Multi-Family Residential | Disposed of by Sale | 160 homes - Brookfield Village - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 10,350    
Gain/(Loss)                         $ 4,497    
Number of homes, dispositions | unit 160 160                     160    
Multi-Family Residential | Disposed of by Sale | 220 homes - Crown Colony - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 17,200    
Gain/(Loss)                         $ 9,324    
Number of homes, dispositions | unit 220 220                     220    
Multi-Family Residential | Disposed of by Sale | 54 homes - Mariposa - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 6,100    
Gain/(Loss)                         $ 1,810    
Number of homes, dispositions | unit 54 54                     54    
Multi-Family Residential | Disposed of by Sale | 300 homes - Sherwood - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 26,150    
Gain/(Loss)                         $ 14,614    
Number of homes, dispositions | unit 300 300                     300    
Multi-Family Residential | Disposed of by Sale | 308 homes - Villa West - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 22,950    
Gain/(Loss)                         $ 7,785    
Number of homes, dispositions | unit 308 308                     308    
Multi-Family Residential | Disposed of by Sale | 152 homes - Crestview - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 8,250    
Gain/(Loss)                         $ 5,569    
Number of homes, dispositions | unit 152 152                     152    
Multi-Family Residential | Disposed of by Sale | 73 homes - North Pointe - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 5,225    
Gain/(Loss)                         $ 2,046    
Number of homes, dispositions | unit 73 73                     73    
Multi-Family Residential | Disposed of by Sale | 108 homes - Kirkwood - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 5,400    
Gain/(Loss)                         $ 2,882    
Number of homes, dispositions | unit 108 108                     108    
Multi-Family Residential | Disposed of by Sale | 65 homes - Westwood Park - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 4,250    
Gain/(Loss)                         $ 2,319    
Number of homes, dispositions | unit 65 65                     65    
Multi-Family Residential | Disposed of by Sale | 16 homes - Pebble Springs - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 875    
Gain/(Loss)                         $ 302    
Number of homes, dispositions | unit 16 16                     16    
Multi-Family Residential | Disposed of by Sale | 192 homes - Arbors - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 16,200    
Gain/(Loss)                         $ 10,090    
Number of homes, dispositions | unit 192 192                     192    
Multi-Family Residential | Disposed of by Sale | 120 homes - Indian Hills - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 8,100    
Gain/(Loss)                         $ 2,798    
Number of homes, dispositions | unit 120 120                     120    
Multi-Family Residential | Disposed of by Sale | 132 homes - Ridge Oaks - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 7,700    
Gain/(Loss)                         $ 3,694    
Number of homes, dispositions | unit 132 132                     132    
Multi-Family Residential | Disposed of by Sale | 50 homes - Cottage West - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 6,991    
Gain/(Loss)                         $ 2,600    
Number of homes, dispositions | unit 50 50                     50    
Multi-Family Residential | Disposed of by Sale | 24 homes - Gables - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 2,515    
Gain/(Loss)                         $ 463    
Number of homes, dispositions | unit 24 24                     24    
Multi-Family Residential | Disposed of by Sale | 79 homes - Oakmont - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 7,010    
Gain/(Loss)                         $ 3,093    
Number of homes, dispositions | unit 79 79                     79    
Multi-Family Residential | Disposed of by Sale | 160 homes - Oakwood - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 12,090    
Gain/(Loss)                         $ 9,034    
Number of homes, dispositions | unit 160 160                     160    
Multi-Family Residential | Disposed of by Sale | 120 homes - Oxbow Park - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 10,452    
Gain/(Loss)                         $ 7,739    
Number of homes, dispositions | unit 120 120                     120    
Multi-Family Residential | Disposed of by Sale | 48 homes - Prairie Winds - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 3,763    
Gain/(Loss)                         $ 2,651    
Number of homes, dispositions | unit 48 48                     48    
Multi-Family Residential | Disposed of by Sale | 44 homes - Sierra Vista - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         $ 3,178    
Gain/(Loss)                         $ 886    
Number of homes, dispositions | unit 44 44                     44    
Multi-Family Residential | Disposed of by Sale | 44 unit - Dakota Commons - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       4,420      
Gain/(Loss)                       $ 542      
Number of homes, dispositions | unit                       44      
Multi-Family Residential | Disposed of by Sale | 145 unit - WIlliston Garden - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 12,310      
Gain/(Loss)                       $ 997      
Number of homes, dispositions | unit                       145      
Interest in joint venture                       74.11%      
Multi-Family Residential | Disposed of by Sale | 288 unit - Renaissance Heights - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 24,770      
Gain/(Loss)                       $ 6,914      
Number of homes, dispositions | unit                       288      
Interest in joint venture                       87.14%      
Multi-Family Residential | Disposed of by Sale | 327 homes - 13 apartment communities - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           12,263  
Gain/(Loss)                           $ 701  
Number of homes, dispositions | unit               327           327  
Number of apartment communities | apartment_community               13           13  
Multi-Family Residential | Disposed of by Sale | 48 homes - Crown - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 5,700  
Gain/(Loss)                           $ 2,382  
Number of homes, dispositions | unit               48           48  
Multi-Family Residential | Disposed of by Sale | 16 homes - Northern Valley - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 950  
Gain/(Loss)                           $ 260  
Number of homes, dispositions | unit               16           16  
Other | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 16,707 $ 12,295 $ 493,042  
Gain/(Loss)                       1,302 2,168 180,938  
Other | Disposed of by Sale | Minot 1400 31st Ave - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         6,530    
Gain/(Loss)                         482    
Other | Disposed of by Sale | Woodbury 1865 Woodland - Woodbury, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         5,765    
Gain/(Loss)                         1,686    
Other | Disposed of by Sale | 7,849 sq ft Minot Southgate Retail - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       1,925      
Gain/(Loss)                       $ (131)      
Area of real estate property (sq ft) | ft²                       7,849      
Other | Disposed of by Sale | 9,052 sq ft Fresenius - Duluth, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 1,900      
Gain/(Loss)                       $ 822      
Area of real estate property (sq ft) | ft²                       9,052      
Other | Disposed of by Sale | 15,000 sq ft Minot 2505 16th St SW - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 1,710      
Gain/(Loss)                       $ (104)      
Area of real estate property (sq ft) | ft²                       15,000      
Other | Disposed of by Sale | 81,594 sq ft Minot Arrowhead - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 6,622      
Gain/(Loss)                       $ 715      
Area of real estate property (sq ft) | ft²                       81,594      
Other | Disposed of by Sale | 100,850 sq ft Bloomington 2000 W 94th Street - Bloomington, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 4,550      
Gain/(Loss)                       $ 0      
Area of real estate property (sq ft) | ft²                       100,850      
Other | Disposed of by Sale | 4,998 sq ft Minot Southgate Wells Fargo Bank - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           3,440  
Gain/(Loss)                           $ 108  
Area of real estate property (sq ft) | ft²               4,998           4,998  
Other | Disposed of by Sale | 90,260 sq ft Lexington Commerce Center - Eagan, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 9,000  
Gain/(Loss)                           $ 5,037  
Area of real estate property (sq ft) | ft²               90,260           90,260  
Other | Disposed of by Sale | 17,640 sq ft Duckwood Medical - Eagan, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 2,100  
Gain/(Loss)                           $ 214  
Area of real estate property (sq ft) | ft²               17,640           17,640  
Other | Disposed of by Sale | 279,834 sq ft Edgewood Vista Hermantown I & II - Hermantown, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 36,884  
Gain/(Loss)                           $ 12,187  
Area of real estate property (sq ft) | ft²               279,834           279,834  
Other | Disposed of by Sale | 518,161 sq ft Urbandale - Urbandale, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 16,700  
Gain/(Loss)                           $ 3,843  
Area of real estate property (sq ft) | ft²               518,161           518,161  
Other | Disposed of by Sale | 36,053 sq ft 3075 Long Lake Road - Roseville, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 18,650  
Gain/(Loss)                           $ 5,884  
Area of real estate property (sq ft) | ft²               36,053           36,053  
Other | Disposed of by Sale | 1,205,432 sq ft 25 Healthcare properties                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 370,268  
Gain/(Loss)                           $ 137,490  
Number of properties sold | property                           25  
Area of real estate property (sq ft) | ft²               1,205,432           1,205,432  
Other | Disposed of by Sale | 43,404 sq ft Garden View - St. Paul, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 14,000  
Gain/(Loss)                           $ 7,809  
Area of real estate property (sq ft) | ft²               43,404           43,404  
Other | Disposed of by Sale | 52,116 sq ft Ritchie Medical - St. Paul, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 16,500  
Gain/(Loss)                           $ 6,081  
Area of real estate property (sq ft) | ft²               52,116           52,116  
Other | Disposed of by Sale | 22,187 sq ft Bismarck 715 East Broadway and Unimproved Land - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 5,500  
Gain/(Loss)                           $ 2,285  
Area of real estate property (sq ft) | ft²               22,187           22,187  
Unimproved Land | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 5,150 4,374    
Gain/(Loss)                       (48) $ 149    
Number of properties sold | property                         3    
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    
Gain/(Loss)                         (156)    
Unimproved Land | Disposed of by Sale | Minot 1525 24th Ave SW - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         725    
Gain/(Loss)                         132    
Unimproved Land | Disposed of by Sale | Weston - Weston, WI                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                         600    
Gain/(Loss)                         173    
Unimproved Land | Disposed of by Sale | Grand Forks Grand Forks Nd                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       3,000      
Gain/(Loss)                       14      
Unimproved Land | Disposed of by Sale | Renaissance Heights - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       750      
Gain/(Loss)                       $ 66      
Interest in joint venture                       70.00%      
Unimproved Land | Disposed of by Sale | Badger Hills Unimproved - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                       $ 1,400      
Gain/(Loss)                       (128)      
Unimproved Land | Disposed of by Sale | Bismarck 4916 Unimproved Land - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Sales price                           $ 3,175  
Gain/(Loss)                           (13)  
Real Estate | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       53,650 105,866 330,862  
Real Estate | Multi-Family Residential | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       33,047 91,514 15,570  
Real Estate | Multi-Family Residential | Disposed of by Sale | 21 homes - Pinehurst - Billings, MT                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         961    
Real Estate | Multi-Family Residential | Disposed of by Sale | 160 homes - Brookfield Village - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         5,853    
Real Estate | Multi-Family Residential | Disposed of by Sale | 220 homes - Crown Colony - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         7,876    
Real Estate | Multi-Family Residential | Disposed of by Sale | 54 homes - Mariposa - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         4,290    
Real Estate | Multi-Family Residential | Disposed of by Sale | 300 homes - Sherwood - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         11,536    
Real Estate | Multi-Family Residential | Disposed of by Sale | 308 homes - Villa West - Topeka, KS                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         15,165    
Real Estate | Multi-Family Residential | Disposed of by Sale | 152 homes - Crestview - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         2,681    
Real Estate | Multi-Family Residential | Disposed of by Sale | 73 homes - North Pointe - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         3,179    
Real Estate | Multi-Family Residential | Disposed of by Sale | 108 homes - Kirkwood - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         2,518    
Real Estate | Multi-Family Residential | Disposed of by Sale | 65 homes - Westwood Park - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         1,931    
Real Estate | Multi-Family Residential | Disposed of by Sale | 16 homes - Pebble Springs - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         573    
Real Estate | Multi-Family Residential | Disposed of by Sale | 192 homes - Arbors - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         6,110    
Real Estate | Multi-Family Residential | Disposed of by Sale | 120 homes - Indian Hills - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         5,302    
Real Estate | Multi-Family Residential | Disposed of by Sale | 132 homes - Ridge Oaks - Sioux City, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         4,006    
Real Estate | Multi-Family Residential | Disposed of by Sale | 50 homes - Cottage West - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         4,391    
Real Estate | Multi-Family Residential | Disposed of by Sale | 24 homes - Gables - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         2,052    
Real Estate | Multi-Family Residential | Disposed of by Sale | 79 homes - Oakmont - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         3,917    
Real Estate | Multi-Family Residential | Disposed of by Sale | 160 homes - Oakwood - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         3,056    
Real Estate | Multi-Family Residential | Disposed of by Sale | 120 homes - Oxbow Park - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         2,713    
Real Estate | Multi-Family Residential | Disposed of by Sale | 48 homes - Prairie Winds - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         1,112    
Real Estate | Multi-Family Residential | Disposed of by Sale | 44 homes - Sierra Vista - Sioux Falls, SD                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         2,292    
Real Estate | Multi-Family Residential | Disposed of by Sale | 44 unit - Dakota Commons - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       3,878      
Real Estate | Multi-Family Residential | Disposed of by Sale | 145 unit - WIlliston Garden - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       11,313      
Real Estate | Multi-Family Residential | Disposed of by Sale | 288 unit - Renaissance Heights - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       17,856      
Real Estate | Multi-Family Residential | Disposed of by Sale | 327 homes - 13 apartment communities - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           11,562  
Real Estate | Multi-Family Residential | Disposed of by Sale | 48 homes - Crown - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           3,318  
Real Estate | Multi-Family Residential | Disposed of by Sale | 16 homes - Northern Valley - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           690  
Real Estate | Other | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       15,405 10,127 312,104  
Real Estate | Other | Disposed of by Sale | Minot 1400 31st Ave - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         6,048    
Real Estate | Other | Disposed of by Sale | Woodbury 1865 Woodland - Woodbury, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         4,079    
Real Estate | Other | Disposed of by Sale | 7,849 sq ft Minot Southgate Retail - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       2,056      
Real Estate | Other | Disposed of by Sale | 9,052 sq ft Fresenius - Duluth, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       1,078      
Real Estate | Other | Disposed of by Sale | 15,000 sq ft Minot 2505 16th St SW - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       1,814      
Real Estate | Other | Disposed of by Sale | 81,594 sq ft Minot Arrowhead - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       5,907      
Real Estate | Other | Disposed of by Sale | 100,850 sq ft Bloomington 2000 W 94th Street - Bloomington, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       4,550      
Real Estate | Other | Disposed of by Sale | 4,998 sq ft Minot Southgate Wells Fargo Bank - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           3,332  
Real Estate | Other | Disposed of by Sale | 90,260 sq ft Lexington Commerce Center - Eagan, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           3,963  
Real Estate | Other | Disposed of by Sale | 17,640 sq ft Duckwood Medical - Eagan, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           1,886  
Real Estate | Other | Disposed of by Sale | 279,834 sq ft Edgewood Vista Hermantown I & II - Hermantown, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           24,697  
Real Estate | Other | Disposed of by Sale | 518,161 sq ft Urbandale - Urbandale, IA                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           12,857  
Real Estate | Other | Disposed of by Sale | 36,053 sq ft 3075 Long Lake Road - Roseville, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           12,766  
Real Estate | Other | Disposed of by Sale | 1,205,432 sq ft 25 Healthcare properties                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           232,778  
Real Estate | Other | Disposed of by Sale | 43,404 sq ft Garden View - St. Paul, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           6,191  
Real Estate | Other | Disposed of by Sale | 52,116 sq ft Ritchie Medical - St. Paul, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           10,419  
Real Estate | Other | Disposed of by Sale | 22,187 sq ft Bismarck 715 East Broadway and Unimproved Land - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           3,215  
Real Estate | Unimproved Land | Disposed of by Sale                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       5,198 4,225    
Real Estate | 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]                              
Property management expenses                         3,205    
Real Estate | Unimproved Land | Disposed of by Sale | Minot 1525 24th Ave SW - Minot, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         593    
Real Estate | Unimproved Land | Disposed of by Sale | Weston - Weston, WI                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                         $ 427    
Real Estate | Unimproved Land | Disposed of by Sale | Grand Forks Grand Forks Nd                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       2,986      
Real Estate | Unimproved Land | Disposed of by Sale | Renaissance Heights - Williston, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       684      
Real Estate | Unimproved Land | Disposed of by Sale | Badger Hills Unimproved - Rochester, MN                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                       $ 1,528      
Real Estate | Unimproved Land | Disposed of by Sale | Bismarck 4916 Unimproved Land - Bismarck, ND                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Property management expenses                           $ 3,188