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Contingencies (Details)
 9 Months Ended
Apr. 17, 2015
Plaintiff
Entity
Insurance_company
People
Apr. 17, 2013
People
Sep. 30, 2016
mine
processingFacility
Loss Contingencies [Line Items]      
Loss contingency, number of processing facilities | processingFacility     3
Pending Litigation      
Loss Contingencies [Line Items]      
Number of people killed   15  
Number of people injured   200  
Number of plaintiffs | Plaintiff 400    
Number of entities that filed claims | Entity 9    
Number of people that filed claims 325    
Number of insurance companies that filed claims | Insurance_company 80    
IDAHO      
Loss Contingencies [Line Items]      
Loss contingency, number of mines | mine     18