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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended
	Dec. 05, 2019	Feb. 26, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interests - operating partnership (in shares)			1,018,000		1,018,000		1,058,000
Common stock outstanding (in shares)			12,976,000		12,976,000		12,098,000
Sale of common shares, net			$ 10,063,000		$ 58,204,000
Repurchase period	1 year
Remaining authorized repurchase amount			$ 44,400,000		$ 44,400,000
Preferred shares of beneficial interest, shares outstanding (in shares)			3,881,000		3,881,000		4,100,000
Preferred shares, liquidation preference (in dollars per share)			$ 25		$ 25
Preferred shares, annual distribution accrual rate (in dollars per share)					$ 1.65625
Preferred shares, dividend rate					6.625%
Preferred shares liquidation preference			$ 97,000,000.0		$ 97,000,000.0
Partnership units, converted (in shares)		1.37931
Conversion price (in dollars per share)		$ 72.50
Series D Preferred Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution rate		3.862%
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
At-The-Market Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate gross sales price of common shares			$ 69,200,000		$ 69,200,000			$ 150,000,000.0
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards issued (in shares)			297	8,662	20,998	15,380
Sale of common shares, net			$ 17,000	$ 473,000	$ 1,000,000.0	$ 930,000

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