SPONSORS AND MANAGEMENT WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2011	Dec. 31, 2012	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 09, 2010
Sponsors and Management Warrants
Warrant liabilities			$ 308,630	$ 366,080
Sponsors Warrants
Sponsors and Management Warrants
Issuance of warrants to purchase common stock (in shares)			1,916,667			8,000,000
Estimated initial value						$ 69,500
Exercise price (in dollars per share)						$ 50.00
Warrants exercised		1,525,272
Number of shares of common stock under warrants repurchased		4,558,061
Payments for repurchase of warrants		$ 80,500
Additional paid-in capital		$ 108,600
Warrant liabilities			$ 126,300	157,100
Management Warrants
Sponsors and Management Warrants
Issuance of warrants to purchase common stock (in shares)	2,862,687		2,862,687		2,862,687
Proceeds from issuance of Management warrants	$ 19,000
Warrant liabilities			$ 182,300	$ 209,000
Management Warrants | Chief Executive Officer [Member]
Sponsors and Management Warrants
Exercise price (in dollars per share)	$ 42.23
Management Warrants | President [Member]
Sponsors and Management Warrants
Exercise price (in dollars per share)	42.23
Management Warrants | Chief Financial Officer [Member]
Sponsors and Management Warrants
Exercise price (in dollars per share)	$ 54.50