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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | $ 2,283 | $ 2,539
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 53 | 1,454
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 2,283 | 2,539
Recurring [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 11 | 761
Recurring [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 42 | 644
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 42 | 644
Recurring [Member] | Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 | 49
Recurring [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 2,241 | 1,895
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 11 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 11 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 2,241 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 0 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 2,241 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 42 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 42 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 42 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 42 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | $ 0 |

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