Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Related Parties Transactions (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2009 Nautilus Poplar, LLC (NP) owner	Sep. 30, 2012 US Federal Tax Withholding	Sep. 30, 2012 US Federal Tax Withholding Young Energy Prize S.A. (YEP)	Sep. 30, 2012 US Federal Tax Withholding White Bear, LLC	Sep. 30, 2012 US Federal Tax Withholding Nautilus Poplar, LLC (NP)
Related Party Transaction [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 0.1	$ 0.6	$ 1.3	$ 2.0
Business Acquisition, Percentage of Membership Interests Acquire	83.50%
Number of Majority Owners	2