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Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	Mar. 31, 2019 USD ($) T	Dec. 31, 2018 T
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 | $	$ 45.9
2019
Derivative Instruments
Fuel swap agreements (metric tons)	648,400	856,800
Percentage of projected requirements	58.00%	58.00%
2020
Derivative Instruments
Fuel swap agreements (metric tons)	830,500	830,500
Percentage of projected requirements	54.00%	54.00%
2021
Derivative Instruments
Fuel swap agreements (metric tons)	488,900	488,900
Percentage of projected requirements	29.00%	28.00%
2022
Derivative Instruments
Fuel swap agreements (metric tons)	322,900	322,900
Percentage of projected requirements	18.00%	19.00%
2023
Derivative Instruments
Fuel swap agreements (metric tons)	0	0
Percentage of projected requirements	0.00%	0.00%

X

- 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

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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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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