SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Plicies [Line Items]
Non-Oil and gas Depreciation, Depletion and Amortization	$ 6,600	$ 3,800	$ 4,500
Capitalized Interest	5,000	4,500	5,100
Production Tax Liability	50,500	29,000
Allocated Share-based Compensation Expense	19,353	19,502	$ 20,068
Revolving Credit Facility [Member]
Significant Accounting Plicies [Line Items]
Amortization of Debt Issuance Costs	$ 6,200	$ 8,800