Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Segment's Revenue [Table Text Block]

Below are the third-party customers that accounted for over 10% of each of our segment’s revenues:

	Successor		Predecessor
	Period September 1, 2020 through December 31, 2020		Period January 1, 2020 through August 31, 2020		For the Year Ended December 31, 2019
Oil and Natural Gas:
CVR Refining, LP	14	%	15	%	14	%
Plains Marketing L.P.	*		11	%	*
Drilling:
EOG Resources, Inc.	28	%	20	%	12	%
QEP Resources, Inc.	23	%	10	%	12	%
Citizen Energy III, LLC	16	%	*		*
Slawson Exploration Company, Inc.	16	%	21	%	11	%
Cimarex Energy Co.	12	%	*		*
Mid-Stream:
ONEOK, Inc.	28	%	31	%	33	%
Range Resources Corporation	15	%	21	%	13	%
Centerpoint Energy Service, Inc.	*		*		10	%

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*    Revenue accounted for less than 10% of the segment's revenues.

Schedule of Fair Values of the Net Assets (Liabilities) [Table Text Block]

At December 31, 2020, the fair values of the net liabilities we had with each of the counterparties regarding our commodity derivative transactions are listed in the table below:

	December 31, 2020
	(In millions)
Bank of Oklahoma	$	(5.4)
Bank of Montreal	(0.3)
Total net liabilities	$	(5.7)