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Summary Of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Segment's Revenue [Table Text Block] Below are the third-party customers that accounted for more than 10% of our segment’s revenues:
201920182017
Oil and Natural Gas:
CVR Refining, LP14 %14 %%
Valero Energy Corporation%10 %%
Energy Transfer Partners (formerly Sunoco Logistics Partners)%%10 %
Drilling:
EOG Resources, Inc.12 %%— %
QEP Resources, Inc.12 %16 %26 %
Slawson Exploration Company, Inc11 %10 %%
Mid-Stream:
ONEOK, Inc.33 %45 %36 %
Range Resources Corporation13 %%%
Centerpoint Energy Service, Inc.10 %%%
Schedule of Fair Values of the Net Assets (Liabilities) [Table Text Block] At December 31, 2019, the fair values of the net assets (liabilities) we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:
 December 31, 2019
 (In millions)
Bank of Montreal$0.4  
Bank of America Merrill Lynch0.2  
Total net assets$0.6