STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Feb. 29, 2020	Aug. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Net proceeds from issuance of common stock		$ 75,100	$ 12,882	$ 75,195
Price per share after underwriting discounts and offering expenses, net ( in dollers per share)		$ 8.34
Common stock repurchase program				125,000
Stock remaining repurchase program authorized amount				$ 37,000
Shares repurchased during period			0	0	10,700,000
Net repurchase price					$ 7.94
Total capital deployed					$ 84,594
Cumulative Redeemable Preferred Stock, Series E [Member]
Class Of Stock [Line Items]
Preferred stock, dividend rate			7.50%	7.50%
Redeemable preferred stock, liquidation preference per share (in dollars per share)			$ 25.00
Redeemable preferred stock, shares issued (in shares)			10,329,000	10,329,000
Redeemable preferred stock, shares outstanding (in shares)			10,329,000	10,329,000
Directors And Employees [Member]
Class Of Stock [Line Items]
Additions to common equity capital related to equity-based awards			$ 3,100	$ 2,600	$ 1,700
IPO [Member]
Class Of Stock [Line Items]
Net proceeds from issuance of common stock	$ 12,900
Price per share after underwriting discounts and offering expenses, net ( in dollers per share)	$ 8.21
Continuous Offering Program [Member] | Cumulative Redeemable Preferred Stock, Series E [Member]
Class Of Stock [Line Items]
Number of shares issued for public offering			0	0	0