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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%