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Other Operating Income, net
 12 Months Ended
Dec. 31, 2015
Other Operating Income, net [Abstract]  
Other Operating Income, net
9. Other Operating Income, net

 

Other operating income, net consists of the following:

 

Year ended December 31, 2015     2014     2013  
                         
Gain on sale of operating assets   $ 113     $ 1 $ 65
Frozen defined-benefit pension plan income     —       1,611     336  
Total other operating income, net   $ 113     $ 1,612   $ 401