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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)