Major Customers And Derivative Counterparties (Tables)

12 Months Ended

Dec. 31, 2011

Major Customers And Derivative Counterparties [Abstract]

Consolidated Oil, NGL And Gas Revenues

	Year Ended December 31,
	2011			2010			2009
Plains Marketing LP		16	%		12	%		10	%
Occidental Energy Marketing Inc		14	%		8	%		7	%
Enterprise Products Partners L.P.		12	%		10	%		6	%

Schedule Of Derivative Assets And Liabilities By Counterparty

	Assets		Liabilities
	(in thousands)
Citibank, N.A.	$	138,267	$	6,850
JP Morgan Chase		117,335		13,070
BNP Paribas		41,879		6,391
Barclays Capital		35,413		4,278
Societe Generale		32,376		2,241
Credit Agricole		28,545		5,487
Toronto Dominion		20,856		1,369
Credit Suisse		16,076		4,779
J. Aron & Company		15,985		3,139
BMO Financial Group		13,146		12,365
Wells Fargo Bank, N.A.		12,539		46,216
Morgan Stanley		4,923		774
Den Norske Bank		4,582		—
Merrill Lynch		153		1,017
Total	$	482,075	$	107,976