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Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions | Mar. 31, 2018 USD ($) T | Dec. 31, 2017 USD ($) T
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Derivative Instruments |  |
Estimated unrealized net loss associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss | $ | $ 19.7 | $ 23.7
2018 |  |
Derivative Instruments |  |
Fuel swap agreements (metric tons) | 512,800 | 673,700
Percentage of projected requirements | 50.00% | 50.00%
2019 |  |
Derivative Instruments |  |
Fuel swap agreements (metric tons) | 668,500 | 668,500
Percentage of projected requirements | 47.00% | 46.00%
2020 |  |
Derivative Instruments |  |
Fuel swap agreements (metric tons) | 531,200 | 531,200
Percentage of projected requirements | 36.00% | 36.00%
2021 |  |
Derivative Instruments |  |
Fuel swap agreements (metric tons) | 224,900 | 224,900
Percentage of projected requirements | 14.00% | 14.00%
2022 |  |
Derivative Instruments |  |
Fuel swap agreements (metric tons) | 0 | 0
Percentage of projected requirements | 0.00% | 0.00%

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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