STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 24, 2017	May 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 27, 2016
Class of Stock [Line Items]
Common stock repurchase program						$ 100,000,000
Redeemable preferred stock, face value			$ 199,059,000	$ 197,172,000
Net proceeds			$ 1,898,000	$ 13,266,000	$ 18,180,000
Cumulative Redeemable Preferred Stock, Series E [Member]
Class of Stock [Line Items]
Redeemable preferred stock, shares issued (in shares)		6,800,000	8,234,000	8,156,000
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
Net proceeds		$ 164,300,000
Cash on hand used in capital transactions		$ 42,700,000
Directors And Employees [Member]
Class of Stock [Line Items]
Additions to common equity capital related to equity-based awards			$ 1,400,000	$ 1,700,000	$ 1,900,000
Subsequent Event [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)	0