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Financial Instruments (Details 2) (USD $)
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12 Months Ended | |
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Dec. 31, 2011
ShortTons
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Dec. 31, 2010
ShortTons
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Commodity Hedges Contract Nine [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Dec. 08, 2009 | Dec. 08, 2009 |
| Commencement Date | Jan. 01, 2010 | Jan. 01, 2010 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | ONP | ONP |
| Notional Amount (in Short Tons per Month) | 2,000 | 2,000 |
| Contract Price Per Short Ton | $ 76.00 | $ 76.00 |
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Commodity Hedges Contract Ten [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Dec. 10, 2009 | Dec. 10, 2009 |
| Commencement Date | Jan. 01, 2010 | Jan. 01, 2010 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | OCC | OCC |
| Notional Amount (in Short Tons per Month) | 2,000 | 2,000 |
| Contract Price Per Short Ton | 82.00 | 82.00 |
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Commodity Hedges Contract Eleven [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Dec. 11, 2009 | Dec. 11, 2009 |
| Commencement Date | Jan. 01, 2010 | Jan. 01, 2010 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | OCC | OCC |
| Notional Amount (in Short Tons per Month) | 2,000 | 2,000 |
| Contract Price Per Short Ton | 82.00 | 82.00 |
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Commodity Hedges Contract Twelve [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Jan. 05, 2010 | Jan. 05, 2010 |
| Commencement Date | Jan. 01, 2010 | Jan. 01, 2010 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | ONP | ONP |
| Notional Amount (in Short Tons per Month) | 2,000 | 2,000 |
| Contract Price Per Short Ton | 84.00 | 84.00 |
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Commodity Hedges Contract Thirteen [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Jan. 06, 2010 | Jan. 06, 2010 |
| Commencement Date | Jan. 01, 2010 | Jan. 01, 2010 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | OCC | OCC |
| Notional Amount (in Short Tons per Month) | 1,000 | 1,000 |
| Contract Price Per Short Ton | 90.00 | 90.00 |
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Commodity Hedges Contract Fourteen [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Jan. 27, 2010 | Jan. 27, 2010 |
| Commencement Date | Feb. 01, 2010 | Feb. 01, 2010 |
| Termination Date | Jan. 31, 2012 | Jan. 31, 2012 |
| Transaction Hedged | OCC | OCC |
| Notional Amount (in Short Tons per Month) | 1,000 | 1,000 |
| Contract Price Per Short Ton | 90.00 | 90.00 |
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Commodity Hedges Contract Fifteen [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Sep. 23, 2010 | Sep. 23, 2010 |
| Commencement Date | Jan. 01, 2011 | Jan. 01, 2011 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | ONP | ONP |
| Notional Amount (in Short Tons per Month) | 1,000 | 1,000 |
| Contract Price Per Short Ton | 95.00 | 95.00 |
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Commodity Hedges Contract Sixteen [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Sep. 28, 2010 | Sep. 28, 2010 |
| Commencement Date | Jan. 01, 2011 | Jan. 01, 2011 |
| Termination Date | Dec. 31, 2011 | Dec. 31, 2011 |
| Transaction Hedged | ONP | ONP |
| Notional Amount (in Short Tons per Month) | 1,000 | 1,000 |
| Contract Price Per Short Ton | 95.00 | 95.00 |
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Commodity Hedges Contract Seventeen [Member]
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| Summary of outstanding hedges | ||
| Inception Date | Oct. 11, 2010 | Oct. 11, 2010 |
| Commencement Date | Jan. 01, 2011 | Jan. 01, 2011 |
| Termination Date | Dec. 31, 2012 | Dec. 31, 2012 |
| Transaction Hedged | OCC | OCC |
| Notional Amount (in Short Tons per Month) | 1,500 | 1,500 |
| Contract Price Per Short Ton | $ 115.00 | $ 115.00 |