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Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | $ 250,341 | $ 68,065
Derivative liabilities | 254,621 | 57,920
Derivatives designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 794 | 550
Derivative liabilities | 8,020 | 1,540
Derivatives designated as hedging instruments | Commodity contracts | Other current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 794 | 528
Derivative liabilities | 834 | 1,519
Derivatives designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets |  | 22
Derivative liabilities | 7,186 | 21
Derivatives not designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 249,547 | 67,515
Derivative liabilities | 246,601 | 56,380
Derivatives not designated as hedging instruments | Commodity contracts | Other current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 95,748 | 59,185
Derivative liabilities | 12,659 | 37,713
Derivatives not designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 142,035 | 3,231
Derivative liabilities | 231,173 | 16,434
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 | 9,520 | 2,065
Derivative liabilities | 214 | 2
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 | 29 | 40
Derivative liabilities | 457 | 1,213
Derivatives not designated as hedging instruments | Foreign currency contracts | Other current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 1,975 | 1,912
Derivative liabilities | 1,463 | 413
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 75 |
Derivative liabilities | 463 | 124
Derivatives not designated as hedging instruments | Foreign currency contracts | Non-current other assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative assets | 165 | 1,082
Derivative liabilities |  | 481
Derivatives not designated as hedging instruments | Foreign currency contracts | Other long-term liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Derivative liabilities | $ 172 |

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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 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. 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + 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 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. 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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