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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | $ 2,282 | $ 2,283
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 332 | 53
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 2,282 | 2,283
Recurring [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 108 | 11
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 23 |
Recurring [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 224 | 42
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 224 | 42
Recurring [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 2,035 | 2,241
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 108 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 23 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets | 108 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities | 23 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits |  |
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 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 2,035 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits |  |
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 | 2,035 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Total | 224 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Total | 224 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodities Contracts [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Derivative Assets |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Carbon credits | 224 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Contractual obligations - carbon credits | 224 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Derivative Financial Instruments, Liabilities |  |

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