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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2015 and 2014 are as follows:

 

     Six Months Ended June 30,  
     2015      2014  

Beginning balance

    $ 5,142       $ 5,421   

Revisions in estimates (1)

      —           (118 ) 

Accretion expense

      40         69   

Obligations settled

      —           (28 ) 
  

 

 

     

 

 

  

Ending balance

    $ 5,182       $ 5,344   
  

 

 

     

 

 

  

 

(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.