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Financial Instruments (Details 2)
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3 Months Ended |
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Mar. 31, 2013
ShortTon
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OCC Hedges Remaining 2013 [Member]
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| Summary of costless collar hedges outstanding | |
| Transaction Hedged | OCC |
| Remaining Tons Hedged (in short tons per year) | 166,500 |
| Weighted Average Floor Strike Price Per Short Ton (in dollars per short ton) | 85 |
| Weighted Average Cap Strike Price Per Short Ton (in dollars per short ton) | 131 |
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ONP Hedges Remaining 2013 [Member]
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| Summary of costless collar hedges outstanding | |
| Transaction Hedged | ONP |
| Remaining Tons Hedged (in short tons per year) | 18,000 |
| Weighted Average Floor Strike Price Per Short Ton (in dollars per short ton) | 65 |
| Weighted Average Cap Strike Price Per Short Ton (in dollars per short ton) | 90 |