Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of Segment's Revenue

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

	2012		2011		2010
Drilling:
QEP Resources, Inc.	15	%	22	%	28	%
Kodiak Oil and Gas Corp.	10	%	6	%	5	%
Oil and Natural Gas:
Valero Energy Corporation	26	%	18	%	7	%
Sunoco Partners Marketing	8	%	10	%	8	%
Mid-Stream:
ONEOK	54	%	54	%	53	%
Gavilon, LLC	10	%	19	%	12	%
ConocoPhillips	4	%	7	%	12	%

Schedule Of Fair Values Of The Net Assets (Liabilities)

At December 31, 2012, 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, 2012
	(In millions)
Comerica Bank	$	8.1
Canadian Imperial Bank of Commerce	2.9
Bank of Montreal	2.6
BBVA Compass Bank	1.4
Bank of America, N.A.	(1.0		)
Total assets (liabilities)	$	14.0