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Derivatives (Details 2) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
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Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | $ 34,862 | $ 15,476
Derivative liabilities | 32,925 | 17,759
Derivatives designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 6,588 | 887
Derivative liabilities | 3,924 | 3,082
Derivatives designated as hedging instruments | Commodity contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 5,348 | 439
Derivative liabilities | 1,838 | 229
Derivatives designated as hedging instruments | Commodity contracts | Short-term derivative liabilities, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 155 |
Derivative liabilities | 2,086 | 2,853
Derivatives designated as hedging instruments | Commodity contracts | Non-current other assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 1,085 | 448
Derivatives not designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 28,274 | 14,589
Derivative liabilities | 29,001 | 14,677
Derivatives not designated as hedging instruments | Commodity contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 25,195 | 11,296
Derivative liabilities | 7,203 | 4,001
Derivatives not designated as hedging instruments | Commodity contracts | Short-term derivative liabilities, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 1,139 | 2,195
Derivative liabilities | 19,983 | 9,519
Derivatives not designated as hedging instruments | Commodity contracts | Non-current other assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 1,468 | 637
Derivative liabilities | 617 | 81
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 122 |
Derivative liabilities | 709 | 502
Derivatives not designated as hedging instruments | Foreign exchange contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 319 | 369
Derivative liabilities | 39 | 185
Derivatives not designated as hedging instruments | Foreign exchange contracts | Short-term derivative liabilities, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 31 | 92
Derivative liabilities | $ 450 | $ 389

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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