EQUITY - Narrative (Details) - USD ($)		3 Months Ended
	Mar. 21, 2013	Mar. 31, 2016	Dec. 31, 2015
Equity [Line Items]
Preferred stock, shares issued (in shares)	5,800,000	5,750,000	5,750,000
Preferred stock, dividend rate, percentage	7.125%
Price per share (in dollars per share)	$ 25.00
Preferred stock, net proceeds from offering	$ 138,300,000
Preferred stock, dividends in arrears		$ 0
Redemption share price (in dollars per share)	$ 25.00
Convertible preferred stock, conversion price (in dollars per share)	$ 25.00
Convertible preferred stock, shares issued upon conversion (in shares)	1.7864
Shares issued as a result of restricted stock unit vestings (in shares)		100,000
Tax withholding obligations on behalf of employees		1,100,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01