STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2013	Jan. 31, 2019
Class Of Stock [Line Items]
Number of shares issued for public offering	9,000,000
Net proceeds from issuance of Common Stock	$ 75,100	$ 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	10,653,000	397,000
Redeemable preferred stock, face value		$ 250,946	$ 250,946
Proceeds from issuance of preferred shares				$ 52,051
Cumulative Redeemable Preferred Stock, Series E [Member]
Class Of Stock [Line Items]
Redeemable preferred stock, shares issued (in shares)		10,329,000	10,329,000		6,800,000
Redeemable preferred stock, face value					$ 170,000
Preferred stock, dividend rate		7.50%	7.50%		7.50%
Redeemable preferred stock, liquidation preference per share (in dollars per share)					$ 25.00
Cumulative Redeemable Preferred Stock, Series E [Member] | Continuous Offering Program [Member]
Class Of Stock [Line Items]
Number of shares issued for public offering		0	0	2,100,000
Proceeds from issuance of preferred shares				$ 51,900
Shares Issued Average Net Price Per Share				$ 24.77
Directors And Employees [Member]
Class Of Stock [Line Items]
Additions to common equity capital related to equity-based awards		$ 2,600	$ 1,700	$ 1,100