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Financial Instruments (Details 4) (USD $) In Thousands	3 Months Ended		9 Months Ended
Financial Instruments (Details 4) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest Rate Swaps [Member] \| Interest and other financing costs [Member] \| Cash Flow Hedging [Member]
Derivatives in ASC 815 Cash Flow Hedging Relationships
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (74)	$ (117)	$ (254)	$ (371)
Interest Rate Swaps [Member] \| Interest and other financing costs [Member] \| Not designated [Member]
Derivatives Not Designated as Hedging Instruments Under ASC 820
Amount of Gain (Loss) Recognized in Income on Derivative	(54)	(1,101)	(617)	(3,089)
Natural Gas [Member] \| Natural gas sales [Member] \| Cash Flow Hedging [Member]
Derivatives in ASC 815 Cash Flow Hedging Relationships
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(5)	(535)	(88)	(2,634)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,486)	(1,489)	(4,410)	(4,417)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)			0
Natural Gas [Member] \| Natural gas sales [Member] \| Not designated [Member]
Derivatives Not Designated as Hedging Instruments Under ASC 820
Amount of Gain (Loss) Recognized in Income on Derivative	(34)	(15)	(162)	(123)
Natural Gas Liquids [Member] \| Natural gas liquids sales [Member] \| Cash Flow Hedging [Member]
Derivatives in ASC 815 Cash Flow Hedging Relationships
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	1,102	(12,869)	(11,496)	6,784
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(6,667)	2,179	(18,755)	577
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	213	(116)	(104)	(145)
Natural Gas Liquids [Member] \| Natural gas liquids sales [Member] \| Not designated [Member]
Derivatives Not Designated as Hedging Instruments Under ASC 820
Amount of Gain (Loss) Recognized in Income on Derivative	556	63	472	214
Crude Oil [Member] \| Condensate and other [Member] \| Cash Flow Hedging [Member]
Derivatives in ASC 815 Cash Flow Hedging Relationships
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	6,901	(3,764)	3,926	(220)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,550)	2,971	(4,682)	7,847
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	518	(39)	558	68
Crude Oil [Member] \| Condensate and other [Member] \| Not designated [Member]
Derivatives Not Designated as Hedging Instruments Under ASC 820
Amount of Gain (Loss) Recognized in Income on Derivative	1,065	(281)	1,814	(205)
Cash Flow Hedging [Member]
Derivatives in ASC 815 Cash Flow Hedging Relationships
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	7,998	(17,168)	(7,658)	3,930
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(9,777)	3,544	(28,101)	3,636
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	731	(155)	454	(77)
Not designated [Member]
Derivatives Not Designated as Hedging Instruments Under ASC 820
Amount of Gain (Loss) Recognized in Income on Derivative	$ 1,533	$ (1,334)	$ 1,507	$ (3,203)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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