EQUITY INVESTMENTS - White Oak (Details) - White Oak - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity method investments results
Total revenues	$ 108,256	$ 42,748
Gross loss	(2,919)	(1,134)	$ (5,404)
Loss from operations	(38,148)	(21,018)	(24,103)
Net loss	$ (69,075)	(46,324)	$ (30,263)
Current assets		37,105
Noncurrent assets		639,953
Current liabilities		71,489
Noncurrent liabilities		$ 372,507