EQUITY - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Sep. 15, 2015	Sep. 30, 2015	Sep. 30, 2014
Class of Stock [Line Items]
Net proceeds from issuance of preferred stock		$ 746,900	$ 0
Depositary Shares, Liquidation Preference Per Share	$ 100.00
Series A preferred stock
Class of Stock [Line Items]
Depositary shares (in shares)	7,700,000
Preferred stock, dividend rate	5.25%
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Issuance of preferred stock (in dollars per share)	$ 100.00
Gross proceeds from issuance of preferred stock	$ 770,000
Net proceeds from issuance of preferred stock	$ 746,900
Preferred stock, liquidation preference (in dollars per share)	$ 1,000
Series A preferred stock | Minimum
Class of Stock [Line Items]
Common stock issuable upon conversion (in shares)	5.8716
Series A preferred stock | Maximum
Class of Stock [Line Items]
Common stock issuable upon conversion (in shares)	7.3394