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Summary Of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
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:
201820172016
Oil and Natural Gas:
CVR Refining, LP14 %%— %
Valero Energy Corporation10 %%11 %
Energy Transfer Partners (formerly Sunoco Logistics Partners)%10 %24 %
Drilling:
QEP Resources, Inc.16 %26 %28 %
Slawson Exploration Company, Inc10 %%%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)%%18 %
Mid-Stream:
ONEOK, Inc.45 %36 %30 %
Range Resources Corporation%%10 %
Koch Energy Services, LLC%%11 %
Tenaska Resources, LLC%%10 %
Schedule of Fair Values of the Net Assets (Liabilities) [Table Text Block] At December 31, 2018, 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:
 12/31/2018
 (In millions)
Bank of Montreal$9.9 
Bank of America Merrill Lynch2.7 
Total net assets$12.6