STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 20, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	Nov. 01, 2017
Class of Stock [Line Items]
Common stock repurchase program						$ 100,000,000
Shares repurchased (in shares)		397,000
Shares repurchased, value		$ 3,460,000
Shares average repurchase price after expenses		$ 8.71
Redeemable preferred stock, face value		$ 250,946,000	$ 199,059,000
Cumulative Redeemable Preferred Stock, Series E [Member]
Class of Stock [Line Items]
Redeemable preferred stock, shares issued (in shares)		10,329,000	8,234,000		6,800,000
Redeemable preferred stock, face value					$ 170,000,000
Preferred stock, dividend rate		7.50%	7.50%		7.50%
Redeemable preferred stock, liquidation preference per share (in dollars per share)					$ 25.00
Directors And Employees [Member]
Class of Stock [Line Items]
Additions to common equity capital related to equity-based awards		$ 1,100,000	$ 1,400,000	$ 1,700,000
Subsequent Event [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)	2,300,000
Shares repurchased, value	$ 20,100,000
Shares average repurchase price after expenses	$ 8.63
Stock remaining repurchase program authorized amount	$ 77,000,000