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Commitments and Contingencies (Details) (USD $) |  | 1 Months Ended
--- | --- | ---
Apr. 30, 2012 Pemex Exploracion y Produccion (PEP) case | May 31, 2014 Alleged violations of risk management plan regulations under the federal Clean Air Act Rancho
Loss Contingencies |  |
Total number of cases filed | 2 |
Amount of civil penalty agreed to |  | $ (260,000)

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- Details
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