Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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:

	2015		2014		2013
Oil and Natural Gas:
Sunoco Logistics Partners L.P.	19	%	14	%	8	%
Valero Energy Corporation	15	%	24	%	25	%
Drilling:
QEP Resources, Inc.	25	%	19	%	18	%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)	7	%	9	%	10	%
Mid-Stream:
ONEOK Partners, L.P.	29	%	44	%	57	%
Tenaska Resources, LLC	18	%	22	%	16	%
Laclede Group, Inc.	12	%	16	%	7	%

Schedule Of Fair Values Of The Net Assets [Table Text Block]

At December 31, 2015, the fair values of the net assets we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9