DIVESTITURE - Additional Information (Details) - Appalachia Properties - Disposal Group, Disposed of by Sale - USD ($) $ in Thousands	2 Months Ended
	Feb. 28, 2017	Feb. 27, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net consideration received for sale of Appalachia Properties		$ 522,500
Predecessor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net consideration received for sale of Appalachia Properties		$ 522,472
Net gain on sale	$ 213,500