Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position Fair Value [Table Text Block]

The following sets forth a summary of the distribution of net fair value of the Company's derivative instruments:

Counterparty	June 30, 2012		December 31, 2011
Credit Suisse	52	%	68	%
BNP Paribas	27	%	19	%
Societe Generale	11	%	2	%
BBVA Compass	6	%	—	%
Shell Energy North America (US) LP	2	%	6	%
Credit Agricole	2	%	5	%
Total	100	%	100	%

Schedule Of U.S. Natural Gas Derivative Positions

The following sets forth a summary of the Company’s U.S. natural gas derivative positions at average delivery location (WAHA and Houston Ship Channel) prices as of June 30, 2012:

Period	Volumes (in MMbtu)	Weighted Average Floor Price ($/MMbtu)		Weighted Average Ceiling Price ($/MMbtu)
2012	11,132,000	$	4.96	$	5.13
2013	10,950,000	$	5.07	$	5.07
2014	3,650,000	$	—	$	5.50

Schedule Of U.S. Crude Oil Derivative Positions

The following sets forth a summary of the Company’s U.S. crude oil derivative positions at average NYMEX prices as of June 30, 2012:

Period	Volumes (in Bbls)	Weighted Average Floor  Price ($/Bbl)		Weighted Average Ceiling  Price ($/Bbl)
2012	883,200	$	86.15	$	105.91
2013	1,861,500	$	87.57	$	104.82
2014	1,095,000	$	91.75	$	103.88
2015	620,500	$	92.79	$	97.18

Schedule Of Derivative Instruments

For the three and six months ended June 30,2012 and 2011, the Company recorded the following related to its oil and gas derivative instruments:

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
	(In thousands)
Realized gain (loss) on derivative instruments, net	$	9,887	$	4,904	$	21,020	$	14,910
Unrealized gain (loss) on derivative instruments, net	28,360		7,161		20,265		(3,032		)
Gain (loss) on derivative instruments, net	$	38,247	$	12,065	$	41,285	$	11,878