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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) - USD ($) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2019 | Dec. 05, 2017 | Dec. 07, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2018 | Dec. 05, 2019 | Nov. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interests Operating Partnership Units |  |  |  | 976,516 | 1,058,142 |  |  |
Common shares outstanding (in shares) |  |  |  | 13,027,172 | 12,098,379 |  |  |
Sale of common shares, net |  |  |  | $ 58,852,000 | $ 22,019,000 |  |  |
Repurchase period |  |  | 1 year |  |  |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  |  | 3,881,453 | 4,100,000 |  |  |
Conversion exchange rate (in dollars per share) | $ 72.50 |  |  |  |  |  |  |
Convertible units (in shares) | 1.37931 |  |  |  |  |  |  |
Payments to acquire additional interest |  |  |  |  | $ 1,300,000 |  |  |
Commons at Southgate - Minot, ND |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  |  |  | 34.50% |  |  |
At-The-Market Offering |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate gross sales price of common shares |  |  |  | $ 68,500,000 |  |  |  | $ 150,000,000.0
Share Repurchase Program |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased |  |  | $ 50,000,000 |  |  |  | $ 50,000,000 |
Repurchase period |  | 1 year |  |  |  |  |  |
Incentive Plan 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares forfeited (in shares) |  |  |  | 2,400 | 3,300 |  |  |
Incentive Plan 2015 | Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity awards issued (in shares) |  |  |  | 21,000 | 18,000 |  |  |
Sale of common shares, net |  |  |  | $ 1,000,000.0 | $ 1,100,000 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Distribution rate |  |  |  |  |  | 6.625% |  |
Liquidation preference per share (in dollars per share) |  |  |  |  |  | $ 25.00 |  |
Distribution accrual rate (in dollars per share) |  |  |  |  |  | $ 1.65625 |  |
Preferred shares liquidation preference |  |  |  | $ 97,000,000.0 | $ 103,000,000.0 |  |  |
Series D Preferred Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred shares of beneficial interest, shares issued (in shares) |  |  |  | 165,600 | 165,600 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  |  | 165,600 | 165,600 |  |  |
Preferred units, issuance price (in dollars per share) |  |  |  | $ 100 | $ 100 |  |  |
Temporary equity, distribution rate | 3.862% |  |  |  |  |  |  |

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