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Financial Instruments (Details)
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Mar. 31, 2013
gal
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|---|---|
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Fuel Hedges Remaining 2013 [Member]
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| Summary of costless collar hedges outstanding | |
| Remaining Gallons Hedged (in gallons per year) | 20,490,000 |
| Weighted Average Contract Price per Gallon (in dollars per gallon) | 3.81 |
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Fuel Hedges Remaining 2014 [Member]
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| Summary of costless collar hedges outstanding | |
| Remaining Gallons Hedged (in gallons per year) | 27,000,000 |
| Weighted Average Contract Price per Gallon (in dollars per gallon) | 3.81 |
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Fuel Hedges Remaining 2015 [Member]
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| Summary of costless collar hedges outstanding | |
| Remaining Gallons Hedged (in gallons per year) | 9,000,000 |
| Weighted Average Contract Price per Gallon (in dollars per gallon) | 3.73 |
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Fuel Hedges Remaining 2016 [Member]
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| Summary of costless collar hedges outstanding | |
| Remaining Gallons Hedged (in gallons per year) | 3,000,000 |
| Weighted Average Contract Price per Gallon (in dollars per gallon) | 3.70 |