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Commitments and Contingencies (Details 2)
1 Months Ended
Apr. 30, 2012
Pemex Exploraciony Produccion (PEP)
case
Sep. 30, 2013
Consolidated Delaware Action
PNG Merger
case
Sep. 30, 2013
Consolidated Texas Action
PNG Merger
case
Oct. 31, 2013
Consolidated Federal Action
PNG Merger
case
Loss Contingencies        
Total number of cases filed 2      
Number of cases filed during the period   2 2 4