Percentage of estimated annual fuel requirements hedged for the remainder of the period.

No definition available.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Clause 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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Note 6 - Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Percent of Projected Fuel Requirements		11.00%	19.00%
Derivative Liability, Fair Value, Net (in Dollars)	$ 0.7
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (in Dollars)	0.3
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (in Dollars)				$ 0.4
Gallons of Diesel [Member]
Derivative, Number of Instruments Held	9,100,000
Gallons of Diesel [Member]
Derivative, Number of Instruments Held			6,800,000