REDEEMABLE PREFERRED STOCK - Narrative (Details) - USD ($)								1 Months Ended		3 Months Ended				6 Months Ended		12 Months Ended	45 Months Ended
	Oct. 15, 2020	Sep. 15, 2020	Aug. 17, 2020	Jun. 03, 2020	Dec. 20, 2019	Nov. 20, 2019	Nov. 21, 2017	Feb. 29, 2020	Nov. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020
Class of Stock [Line Items]
Proceeds from issuance of preferred stock and warrants														$ 135,393,000
Issuance offering costs for preferred stock and warrants														10,877,000
Non-issuance offering costs for preferred stock and warrants														$ 6,833,000
Preferred stock redemption, trading days prior to redemption								20 days						20 days
Redeemable preferred stock dividends										$ 52,000		$ 0		$ 213,000	$ 0
Reclassification of Series A Preferred Stock from temporary equity to permanent equity										9,739,000	$ 6,948,000	10,825,000	$ 8,890,000	16,687,000	19,715,000		$ 81,640,000
Redeemable preferred stock redemptions										$ 56,000		$ 4,000		66,000	8,000
Initial dividend on common stock					$ 4,380,644.70
Initial dividend, common stock, paid														$ 2,207,000	$ 10,950,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)										5,408,954				5,408,954			5,408,954
Proceeds from issuance of preferred stock and warrants														$ 134,460,000
Issuance offering costs for preferred stock and warrants														10,731,000
Reclassification to deferred rent receivable and charges														$ 1,004,000
Preferred stock, shares outstanding (in shares)										5,324,109				5,324,109			5,324,109
Preferred stock, shares redeemed (in shares)														84,845
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)										6,900				6,900		0	6,900
Proceeds from issuance of preferred stock and warrants														$ 172,000
Issuance offering costs for preferred stock and warrants														4,000
Reclassification to deferred rent receivable and charges														$ 1,000
Preferred stock, shares outstanding (in shares)										6,900		0		6,900	0	0	6,900
Preferred stock, shares redeemed (in shares)														0
Cumulative dividend rate								5.65%
Preferred dividend per share per year (in usd per share)				$ 0.353125				$ 0.35313
Preferred dividends, per share amount (in usd per share)										$ 0.35313	$ 0.588542
Preferred stock, par value (in usd per share)								$ 25.00		0.001				$ 0.001		$ 0.001	$ 0.001
Preferred stock, liquidation preference per share (in usd per share)										$ 25.00				$ 25.00		$ 25.00	$ 25.00
Series A Preferred Unit
Class of Stock [Line Items]
Number of securities called by warrants or rights (in shares)										1,194,159				1,194,159			1,194,159
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)										1,794,461				1,794,461		1,630,821	1,794,461
Preferred stock, shares outstanding (in shares)										1,763,661				1,763,661		1,630,421	1,763,661
Cumulative dividend rate														5.50%
Preferred dividend per share per year (in usd per share)														$ 0.34375
Preferred dividends declared (in usd per share)				$ 0.34375
Preferred dividends, per share amount (in usd per share)										$ 0.34375	$ 0.68750	$ 0.34375	$ 0.34375
Preferred stock, par value (in usd per share)										0.001				0.001		$ 0.001	$ 0.001
Preferred stock, liquidation preference per share (in usd per share)										$ 25.00				$ 25.00		$ 25.00	$ 25.00
Series L Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)							8,080,740			8,080,740				8,080,740		5,387,160	8,080,740
Preferred stock, shares outstanding (in shares)										8,080,740				8,080,740		5,387,160	8,080,740
Cumulative dividend rate							5.50%
Preferred dividend per share per year (in usd per share)							$ 1.56035
Preferred stock, par value (in usd per share)										$ 0.001				$ 0.001		$ 0.001	$ 0.001
Preferred stock, liquidation preference per share (in usd per share)										$ 28.37				$ 28.37		$ 28.37	$ 28.37
Failure to declare or pay distributions, temporary increase per year							1.00%
Failure to declare or pay distributions, temporary increase per year, maximum increase							8.50%
Minimum fixed charge coverage ratio							125.00%
Registration Statement
Class of Stock [Line Items]
Warrant right to purchase a share of common stock (in shares)										0.25				0.25			0.25
Registration Statement | Series A Preferred Stock
Class of Stock [Line Items]
Redeemable preferred stock, par value (in usd per share)										$ 0.001				$ 0.001			$ 0.001
Preferred stock, stated value (in usd per share)										$ 25.00				$ 25.00			$ 25.00
Registration Statement | Series L Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in usd per share)							$ 28.37
Tender Offer | Series L Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (in usd per share)						$ 1.39
Shares repurchased (in shares)									2,693,580
Purchase price (in usd per share)									$ 29.12
Dividends, preferred stock, aggregate value						$ 3,744,000
Professional fees									$ 462,000
Cost to repurchase tendered shares									$ 75,155,000
Redeemable preferred stock redemptions																$ 5,873,000
Forecast | Series D Preferred Stock
Class of Stock [Line Items]
Preferred dividends, per share amount (in usd per share)	$ 0.117708	$ 0.117708	$ 0.117708
Forecast | Series A Preferred Stock
Class of Stock [Line Items]
Preferred dividends, per share amount (in usd per share)	$ 0.114583	$ 0.114583	$ 0.114583
Series A Preferred Warrants
Class of Stock [Line Items]
Warrants issued (in shares)										4,603,287				4,603,287			4,603,287
Proceeds from issuance of preferred stock and warrants														$ 761,000
Issuance offering costs for preferred stock and warrants														142,000
Reclassification to deferred rent receivable and charges														$ 5,000
Warrants outstanding (in shares)										4,603,287				4,603,287			4,603,287