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Other Operating Income, net
12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Other Operating Income, net
10.Other Operating Income, Net

 

Other operating income, net consists of the following:

 

Year ended December 31,  2018   2017   2016 
             
Gain (loss) on sale of operating assets  $10   $(31)  $5