v2.4.0.6

Risk Management Activities (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Derivatives, Fair Value [Line Items] |  |  |
Derivatives Assets, Current | $ 32,711,000 |  | $ 166,135,000
Derivative Liabilities, Current | 14,108,000 |  | 7,617,000
Foreign Currency Exchange Rate Derivative [Abstract] |  |  |
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap | 1,700,000 | 1,500,000 |
Interest Rate Derivative [Abstract] |  |  |
Interest Rate Swap, Notional Amount | 350,000,000 |  |
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From Interest Rate Swap | 500,000 | (400,000) |
Derivative Collateral [Abstract] |  |  |
Collateral Held on Derivative | 0 |  | 6,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Assets From Price Risk Management Activities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives Assets, Current | 33,000,000 |  | 166,000,000
Derivative Assets, Current, Gross | 72,000,000 |  | 257,000,000
Derivative Liabilities, Current, Gross | 39,000,000 |  | 91,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Liabilities From Price Risk Management Activities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liabilities, Current | 14,000,000 |  | 8,000,000
Derivative Assets, Current, Gross | 14,000,000 |  | 9,000,000
Derivative Liabilities, Current, Gross | 28,000,000 |  | 17,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Liabilities | 45,000,000 |  | 13,000,000
Derivative Assets, Noncurrent, Gross | 11,000,000 |  |
Derivative Liabilities, Noncurrent, Gross | 56,000,000 |  | 13,000,000
Foreign Currency Swap [Member] | Other Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liabilities, Current | 49,000,000 |  | 0
Foreign Currency Swap [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Liabilities | 0 |  | 55,000,000
Interest Rate Swap [Member] | Other Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liabilities, Current | 3,000,000 |  | 0
Interest Rate Swap [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Liabilities | $ 0 |  | $ 4,000,000
Crude Oil Derivative Contracts January (closed) [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 101,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 99.29 |  |
Crude Oil Derivative Contracts February - March (closed) [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 109,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 99.17 |  |
Crude Oil Derivative Contracts April [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 109,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 99.17 |  |
Crude Oil Derivative Contracts May - June [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 101,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 99.29 |  |
Crude Oil Derivative Contracts July - December [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 93,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 98.44 |  |
Volumes (Bbld) - Derivative Option Contracts | 62,000 |  |
Average Price ($/Bbl) - Derivative Option Contracts | 100.24 |  |
Crude Oil Derivative Contracts May - July [Member] |  |  |
Derivative [Line Items] |  |  |
Volumes (Bbld) - Derivative Option Contracts | 8,000 |  |
Average Price ($/Bbl) - Derivative Option Contracts | 97.66 |  |
Crude Oil Derivative Contracts Year Two January - December [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (Bbld) | 40,000 |  |
Derivative Weighted Average Price Crude Oil ($/Bbl) | 95.77 |  |
Crude Oil Derivative Contracts Year Two January - June [Member] |  |  |
Derivative [Line Items] |  |  |
Volumes (Bbld) - Derivative Option Contracts | 54,000 |  |
Average Price ($/Bbl) - Derivative Option Contracts | 98.91 |  |
Crude Oil Derivative Contracts Year Two July - December [Member] |  |  |
Derivative [Line Items] |  |  |
Volumes (Bbld) - Derivative Option Contracts | 40,000 |  |
Average Price ($/Bbl) - Derivative Option Contracts | 95.77 |  |
Natural Gas Derivative Contracts January - April (closed) [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (MMBtud) | 150,000 |  |
Derivative Weighted Average Price Natural Gas ($/MMBtu) | 4.79 |  |
Natural Gas Derivative Contracts May - December [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (MMBtud) | 150,000 |  |
Derivative Weighted Average Price Natural Gas ($/MMBtu) | 4.79 |  |
Volumes (MMBtud) - Derivative Option Contracts | 150,000 |  |
Average Price ($/MMBtu) - Derivative Option Contracts | 4.79 |  |
Natural Gas Derivative Contracts Year Two January - December [Member] |  |  |
Derivative [Line Items] |  |  |
Volume (MMBtud) | 100,000 |  |
Derivative Weighted Average Price Natural Gas ($/MMBtu) | 4.48 |  |
Volumes (MMBtud) - Derivative Option Contracts | 250,000 |  |
Average Price ($/MMBtu) - Derivative Option Contracts | 4.66 |  |

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