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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
Minimum
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Dec. 31, 2012
Maximum
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Mar. 31, 2012
US Federal Tax Withholding
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Dec. 31, 2012
US Federal Tax Withholding
Accrued and Other Liabilities
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Dec. 31, 2012
US Federal Tax Withholding, Interest
Accrued and Other Liabilities
|
Mar. 31, 2012
Young Energy Prize S.A. (YEP)
US Federal Tax Withholding
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Mar. 31, 2012
White Bear, LLC
US Federal Tax Withholding
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Oct. 31, 2009
Nautilus Poplar, LLC (NP)
owner
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Mar. 31, 2012
Nautilus Poplar, LLC (NP)
US Federal Tax Withholding
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Dec. 31, 2012
Mr. Bogachev
US Federal Tax Withholding
Accrued and Other Liabilities
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|---|---|---|---|---|---|---|---|---|---|---|
| Related Party Transaction [Line Items] | ||||||||||
| Loss Contingency, Estimate of Possible Loss | $ 0.1 | $ 0.6 | $ 1.3 | $ 2.0 | ||||||
| Amount of Income Tax Liability, If Not Paid by Related Party | 0.6 | 0.8 | ||||||||
| Business Acquisition, Percentage of Membership Interests Acquire | 83.50% | |||||||||
| Number of Majority Owners | 2 | |||||||||
| Loss Contingency Accrual, at Carrying Value | $ 0.7 | $ 0.1 | $ 0.6 |