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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2016
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 are as follows:

 

     Three Months Ended
March 31,		  
     2016      2015  

Beginning balance

    $ 5,221       $ 5,142   

Accretion expense

      —           20   
  

 

 

     

 

 

  

Ending balance

    $ 5,221       $ 5,162