v3.10.0.1

Financial Instruments - Outstanding Fuel Hedges (Details) - Fuel Hedges Remaining 2018	Jun. 30, 2018 gal $ / gal
Derivative [Line Items]
Gallons Hedged (in gallons per year) | gal	3,750,000
Weighted Average Contract Price per Gallon (in dollars per gallon) | $ / gal	2.59

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

+ Details

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X

- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

+ References

No definition available.

+ Details

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Data Type:	us-types:perUnitItemType
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X

- 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.

+ Details

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X

- Details

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