BUSINESS COMBINATIONS Pro Form Detail (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
September 2016 Common Stock Issuance [Member]
Business Acquisition [Line Items]
Shares issued pursuant to sale of equity	9,085
Delaware Basin [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Net Income (Loss)	$ (270,942)	$ (138,904)
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ (4.22)	$ (2.41)
Business Acquisition, Pro Forma Revenue	$ 412,746	$ 598,932
Delaware Basin Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	5,600
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	$ (1,700)