Derivative Instruments And Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Instruments And Hedging Activities [Abstract]

Volumes Under Derivative Contracts Related To Oil And Gas Producing Activities

Production Period	Instrument Type	Average Monthly Volumes	Weighted Average Price a
Crude Oil:			(per barrel)
April 2012 — December 2012................	Collar	75.0 MBbl	$96.67 — $118.57b
April 2012 — December 2012................	Collar	118.6 MBbl	$99.52 — $118.06
April 2012 — December 2012................	Swap	11.4 MBbl	$103.20
January 2013 — December 2013...........	Swap	41.7 MBbl	$99.15
January 2013 — December 2013...........	Collar	50.0 MBbl	$95.83 — $105.50
Natural Gas:			(per Mcf)
April 2012 — December 2012................	Swap	771.1 Mmcf	$4.32
April 2012 — December 2012................	Collar	162.2 Mmcf	$4.75 —$5.09
January 2013 — December 2013...........	Swap	500.0 Mmcf	$4.09

a.The prices quoted in the table above are NYMEX Henry Hub for natural gas.Most of our current contracts are indexed to the Brent crude oil price.

b.This contract is priced using NYMEX West Texas Intermediate for crude oil.

Derivatives Designated As Hedging Instruments

	As of March 31, 2012			As of December 31, 2011
	Balance Sheet Location		Fair Value	Balance Sheet Location		Fair Value
Asset Derivatives:
Natural gas contracts...........................	Other current assets	$	16,744	Other current assets	$	12,957
Oil contracts...........................................	Other current assets		931	Other current assets		8,567
Natural gas contracts...........................	Other assets		2,564	Other assets		857
Interest rate swaps...............................	Other assets		83	Other assets		327
		$	20,322		$	22,708
	As of March 31, 2012			As of December 31, 2011
	Balance Sheet Location		Fair Value	Balance Sheet Location		Fair Value
Liability Derivatives:
Oil contracts...........................................	Accrued liabilities	$	14,816	Accrued liabilities	$	886
Interest rate swaps...............................	Accrued liabilities		338	Accrued liabilities		202
Oil contracts...........................................	Other long-term liabilities		8,831	Other long-term liabilities		1,711
		$	23,985		$	2,799

Derivatives Not Designated As Hedging Instruments

	As of March 31, 2012			As of December 31, 2011
	Balance Sheet Location		Fair Value	Balance Sheet Location		Fair Value
Asset Derivatives:
Foreign exchange forwards.........	Other current assets	$	110	Other current assets	$	55
		$	110		$	55
	As of March 31, 2012			As of December 31, 2011
	Balance Sheet Location		Fair Value	Balance Sheet Location		Fair Value
Liability Derivatives:
Foreign exchange forwards.........	Accrued liabilities	$	13	Accrued liabilities	$	159
		$	13		$	159

Impact Of Derivative Instruments On Accumulated Comprehensive Income (Loss)

		Gain (Loss) Recognized in Accumulated OCI on Derivatives
		2012			2011
		(in thousands)
Oil and natural gas commodity contracts........	$	(13,555	)	$	(10,778	)
Interest rate swaps.........................................		(247	)		211
	$	(13,802	)	$	(10,567	)

Gain (Loss) Reclassified From Accumulated OCI Into Income

	Location of Gain (Loss) Reclassified from Accumulated OCI into Income		Gain (Loss) Recognized from Accumulated OCI into Income
			2012			2011
			(in thousands)
Oil and natural gas commodity contracts..................................................	Oil and gas revenue	$	109		$	(6,325	)
Interest rate swaps.................................	Net interest expense		(193	)		(480	)
		$	(84	)	$	(6,805	)

Impact Of Non Designated Derivative Instruments On Income Statement

	Location of Gain (Loss) Recognized in Income on Derivatives		Gain (Loss) Recognized in Income on Derivatives
			2012		2011
			(in thousands)
Foreign exchange forwards.........	Other expense		233		608
		$	233	$	608