The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References+ Details

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended	4 Months Ended
	Jun. 30, 2013 High Sierra	May 30, 2013 Pecos	Feb. 28, 2013 Pecos
Legal contingencies
Amount not paid by customer for disputed transportation rate schedule			$ 1.7
Amount requested as refund by the customer		5.5
Amount of fuel taxes and sales taxes that should have been collected from customers and remitted to taxing authority	14.9
Amount expected to be recovered from the customers, if required to pay the taxes assessed	14.1
Asset retirement obligations
Asset retirement obligations	$ 1.6