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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Liability Associated with Potsdam

The changes to the environmental remediation liability associated with the Potsdam environmental remediation liability for the nine months ended September 30, 2015 and 2014 are as follows:

 

     Nine Months Ended September 30,  
     2015      2014  

Beginning balance

    $ 5,142       $ 5,421   

Revisions in estimates (1)

      —           (118 ) 

Accretion expense

      59         103   

Obligations settled

      —           (298 ) 
  

 

 

     

 

 

  

Ending balance

    $ 5,201       $ 5,108   
  

 

 

     

 

 

  

 

(1) Associated with changes in estimated future costs to complete the remediation, the discount rate and/or the portion of the total remediation costs that we are responsible for.