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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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:
 
2017
 
2016
 
2015
Oil and Natural Gas:
 
 
 
 
 
Sunoco Logistics Partners L.P.
10
%
 
24
%
 
19
%
Valero Energy Corporation
9
%
 
11
%
 
15
%
Drilling:
 
 
 
 
 
QEP Resources, Inc.
26
%
 
28
%
 
25
%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)
7
%
 
18
%
 
7
%
Mid-Stream:
 
 
 
 
 
ONEOK, Inc.
36
%
 
30
%
 
29
%
Range Resources Corporation
9
%
 
10
%
 
5
%
Koch Energy Services, LLC
8
%
 
11
%
 
9
%
Tenaska Resources, LLC
6
%
 
10
%
 
18
%
Laclede Group, Inc.
1
%
 
9
%
 
12
%
Schedule of Fair Values of the Net Assets (Liabilities) [Table Text Block]
At December 31, 2017, 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, 2017
 
(In millions)
Canadian Imperial Bank of Commerce
$
0.7

Bank of America Merrill Lynch
(2.5
)
Bank of Montreal
(5.3
)
Total assets (liabilities)
$
(7.1
)