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Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions	Dec. 31, 2015 gal	[1]
2016
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	1,226
2017
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	1,503
2018
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	731
[1] Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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