EQUITY AND MEZZANINE EQUITY (Details) - USD ($)					8 Months Ended	12 Months Ended
	Feb. 26, 2019	Dec. 05, 2018	Dec. 05, 2017	Dec. 07, 2016	Dec. 31, 2018	Dec. 31, 2019	Apr. 30, 2018	Dec. 05, 2019	Nov. 30, 2019
Class of Stock [Line Items]
Noncontrolling interests - Operating Partnership (in shares)					1,367,502	1,058,142	1,409,943
Equity Awards
Common shares outstanding (in shares)					11,942,372	12,098,379	11,952,598
Share Repurchase Program
Repurchase period		1 year		1 year
Shares remaining authorized un share repurchase program						$ 50,000,000.0
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]
Preferred shares issued (in shares)					4,118,460	4,118,460	4,118,460
Preferred shares liquidation preference					$ 102,971,475	$ 102,971,475	$ 102,971,475
Series D Preferred Units (Mezzanine Equity) [Abstract]
Series D Preferred Units, shares issued (in shares)					0	166,000	0
Series D Preferred Units, par value (in dollars per shares)					$ 100	$ 100	$ 100
Series D preferred units, conversion rate (in shares)	1.37931
Series D preferred units, conversion exchange rate (in dollars per share)	$ 72.50
Redeemable Noncontrolling Interest (Mezzanine Equity) [Abstract]
Payments for acquisition of noncontrolling interest						$ 1,300,000
Commons and Landing at Southgate Partnership
Redeemable Noncontrolling Interest (Mezzanine Equity) [Abstract]
Noncontrolling interest acquired						34.50%
Share Repurchase Program
Share Repurchase Program
Authorized share repurchase amount				$ 50,000,000				$ 50,000,000
Repurchase period			1 year
2015 Incentive Plan
Equity Awards
Forfeited (in shares)					200	3,300	3,200
2015 Incentive Plan | Performance Shares
Equity Awards
Shares issued (in shares)					5,600	18,000	9,300
Shares issued					$ 347,000	$ 1,100,000	$ 536,000
Series C Preferred Stock
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]
Preferred shares issued (in shares)							4,118,460
Distribution rate percentage							6.625%
Liquidation preference per share (in dollars per share)							$ 25.00
Distribution accrual rate							$ 1.65625
Preferred shares liquidation preference							$ 103,000,000.0
Series B Preferred Stock
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]
Distribution rate percentage							7.95%
Shares redeemed (in shares)							4,600,000
Series D Preferred Units
Series D Preferred Units (Mezzanine Equity) [Abstract]
Series D Preferred Units, shares issued (in shares)	165,600
Series D Preferred Units, par value (in dollars per shares)	$ 100
Series D preferred units, distribution rate percentage	3.862%
2019 ATM Program
Equity Distribution Agreement [Abstract]
Aggregate gross sales price of common shares						$ 127,700,000			$ 150,000,000.0
Common Shares of Beneficial Interest, shares issued (in shares)						308,444
Average per share price of common shares issued (in dollars per share)						$ 72.29
Net consideration for common shares						$ 22,000,000.0