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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2015 and 2014 are as follows:

 

     Three Months Ended March 31,  
     2015      2014  

Beginning balance

    $ 5,142       $ 5,421   

Accretion expense

      20         34   

Obligations settled

      —           (26 ) 
  

 

 

     

 

 

  

Ending balance

 $ 5,162    $ 5,429