Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Segment's Revenues

	2011			2010			2009
	(In thousands)
Drilling:
QEP Resources, Inc.		22	%		28	%		35	%
Oil and Natural Gas:
Valero Energy Corporation		18	%		7	%		5	%
Sunoco Partners Marketing		10	%		8	%		7	%
Mid-Stream:
ONEOK		54	%		53	%		52	%
Gavilon, LLC		19	%		12	%		0	%
ConocoPhillips		7	%		12	%		15	%
Tenaska		1	%		7	%		17	%

Schedule Of Fair Values Of The Net Assets (Liabilities)

	December 31, 2011
	(In millions)
Bank of Montreal	$	18.7
Bank of America, N.A.		6.5
BNP Paribas		6.1
Comerica Bank		1.4
BBVA Compass Bank		1.0
BP Corporation		0.2
Crédit Agricole Corporate and Investment Bank, London Branch		0.1
Macquarie Bank		(0.2	)
Total assets (liabilities)	$	33.8