SUPPLEMENTAL CASH FLOW INFORMATION (Supplemental Disclosures To The Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2018	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2019
Supplemental cash flow information:
Cash paid for interest		$ 1,145	$ 52,017	$ 56,683
Cash paid for income taxes		0	1,573	706
Non-cash investing and financing activities:
Increase in asset retirement obligations		0	5,665	853
Increase (decrease) in accruals or payables for capital expenditures		4,896	39,997	(155,681)
Increase in withholding tax accruals for share-based compensation		0	534	142
Distribution of non-STACK assets, net of liabilities		43,482	0	0
Equity issued in Business Combination		0	2,067,393	0
Release of common stock from possible redemption	$ 996,384	0	996,384	0
Other		$ 0	$ (6)	$ 78