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Commitments (Details Textual) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
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Jun. 30, 2014
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| Commitments And Contingencies Disclosure [Line Items] | |
| Increase In Reclamation Amount | $ 26.7 |
| Increase In Security Bonds | 3.1 |
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True Drilling LLC [Member]
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| Commitments And Contingencies Disclosure [Line Items] | |
| Contractual Obligation Paid Amount | $ 3.2 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of contractual obligation which was paid in the current year. No definition available.
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| X | ||||||||||
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- Definition
The amount increased for the purpose of requirements of bonding reclamation. No definition available.
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| X | ||||||||||
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- Definition
Increase In Security Bonds No definition available.
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