COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Sep. 30, 2013	Aug. 31, 2013	Jun. 30, 2013	Oct. 31, 2009	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Rental expense					$ 18,600	$ 26,600	$ 19,800
Stock issued upon conversion (in shares)				9,336,905
Litigation Related To 2009 Exchange Offer [Member]
Loss Contingencies [Line Items]
Loss contingency, loss in period								$ 8,900
Loss contingency, payments		$ 8,900
Insurance recoveries	$ 1,800
SEC Investigation [Member]
Loss Contingencies [Line Items]
Civil penalty			$ 850