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Derivative instrument average price per unit

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Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a forward purchase contract.

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Weighted average fixed price per unit related to the group of price risk swap derivatives.

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Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair value as of the balance sheet date of all interest rate derivatives designated as cash flow hedging instruments.

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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The aggregate increase (decrease) in the market value of open derivatives, commodity, or energy contracts. These gains (losses) are included in earnings.

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-Publisher FASB
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Risk Management Activities (Details) (USD $)	3 Months Ended		6 Months Ended
Risk Management Activities (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Notes To Financial Statements [Abstract]
Gains on Mark-to-Market Commodity Derivative Contracts	$ 189,621,000	$ 37,015,000	$ 122,875,000	$ 44,818,000
Realized Gains (Losses)			31,285,000	38,827,000
Assets from Price Risk Management Activities	109,225,000		109,225,000		48,153,000
Liabilities from Price Risk Management Activities	12,393,000		12,393,000		28,339,000
Derivative [Line Items]
Principal amount of notes issued by Canadian subsidiary, whose exchange rate is hedged by foreign currency swap transaction	150,000,000		150,000,000
After-tax impact on OCI as a result of the foreign currency swap transaction.	(1,000,000)	1,000,000	(100,000)	4,000,000
Derivatives, Fair Value [Line Items]
Derivatives Assets, Current	109,225,000		109,225,000		48,153,000
Derivative Liabilities, Current	12,393,000		12,393,000		28,339,000
Interest Rate Cash Flow Hedges [Abstract]
Interest Rate Swap, Notional Amount	350,000,000		350,000,000
Interest Rate Swap, at Fair Value	(2,000,000)		(2,000,000)
Principal amount of Floating Rate Senior notes, whose interest rate is hedged by an interest rate swap transaction	350,000,000		350,000,000
After-tax impact on OCI as a result of the interest rate swap transaction.	(4,000,000)		(3,000,000)
Natural Gas Financial Price Swap Contracts Year Two [Member]
Derivative [Line Items]
Volume (MMBtud)			525000
Volumes (MMBtud) - Swaption Contracts			425000
Average Price ($/MMBtu) - Swaption Contracts			5.44
Derivative Swap Type Weighted Average Fixed Price			5.44
Crude Oil Financial Price Swap Contracts Year Two [Member]
Derivative [Line Items]
Volume (Bbld)			9000
Derivative Weighted Average Price Crude Oil			107.12
Natural Gas Financial Price Swap Contract Current Year Period One [Member]
Derivative [Line Items]
Volume (MMBtud)			275000
Volumes (MMBtud) - Swaption Contracts			500000
Average Price ($/MMBtu) - Swaption Contracts			4.73
Derivative Swap Type Weighted Average Fixed Price			5.19
Natural Gas Financial Price Swap Contracts Current Year Period Two [Member]
Derivative [Line Items]
Volume (MMBtud)			425000
Derivative Swap Type Weighted Average Fixed Price			5.09
Natural Gas Financial Price Swap Contracts Current Year Period Three [Member]
Derivative [Line Items]
Volume (MMBtud)			425000
Derivative Swap Type Weighted Average Fixed Price			5.09
Natural Gas Financial Price Swap Contracts Current Year Period Four [Member]
Derivative [Line Items]
Volume (MMBtud)			475000
Derivative Swap Type Weighted Average Fixed Price			5.03
Natural Gas Financial Price Swap Contracts Current Year Period Five [Member]
Derivative [Line Items]
Volume (MMBtud)			650000
Derivative Swap Type Weighted Average Fixed Price			4.90
Crude Oil Financial Price Swap Contracts Current Year Period One [Member]
Derivative [Line Items]
Volume (Bbld)			17000
Derivative Weighted Average Price Crude Oil			90.44
Crude Oil Financial Price Swap ContractsCurrent Year Period Two [Member]
Derivative [Line Items]
Volume (Bbld)			18000
Derivative Weighted Average Price Crude Oil			90.69
Crude Oil Financial Price Swap Contracts Current Year Period Three [Member]
Derivative [Line Items]
Volume (Bbld)			20000
Derivative Weighted Average Price Crude Oil			91.82
Crude Oil Financial Price Swap Contracts Current Year Period Four [Member]
Derivative [Line Items]
Volume (Bbld)			24000
Derivative Weighted Average Price Crude Oil			93.61
Crude Oil Financial Price Swap Contracts Current Year Period Seven [Member]
Derivative [Line Items]
Volume (Bbld)			24000
Derivative Weighted Average Price Crude Oil			93.61
Crude Oil Financial Price Swap Contract Current Year Period Six [Member]
Derivative [Line Items]
Volume (Bbld)			30000
Derivative Weighted Average Price Crude Oil			97.02
Crude Oil Financial Price Swap Current Year Period Seven [Member]
Derivative [Line Items]
Derivative Weighted Average Price Crude Oil			97.02
Natural Gas Financial Price Swap Contracts Current Year Period Six [Member]
Derivative [Line Items]
Volume (MMBtud)			650000
Derivative Swap Type Weighted Average Fixed Price			4.90
Natural Gas Financial Price Swap Contracts Current Year Period Seven [Member]
Derivative [Line Items]
Volume (Bbld)			650,000
Derivative Weighted Average Price Crude Oil			4.90
Derivative Swap Type Weighted Average Fixed Price			4.90
Foreign Currency and Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities	64,000,000		64,000,000		53,000,000
Crude oil and natural gas price swaps and natural gas swaptions [Member]
Notes To Financial Statements [Abstract]
Assets from Price Risk Management Activities	109,000,000		109,000,000
Liabilities from Price Risk Management Activities	12,000,000		12,000,000
Derivatives, Fair Value [Line Items]
Derivatives Assets, Current	109,000,000		109,000,000
Other Assets	35,000,000		35,000,000
Derivative Liabilities, Current	12,000,000		12,000,000
Other Liabilities	2,000,000		2,000,000
Crude oil price swaps, natural gas price and basis swaps and natural gas swaptions [Member]
Notes To Financial Statements [Abstract]
Assets from Price Risk Management Activities					51,000,000
Liabilities from Price Risk Management Activities					30,000,000
Derivatives, Fair Value [Line Items]
Derivatives Assets, Current					51,000,000
Other Assets					18,000,000
Derivative Liabilities, Current					$ 30,000,000