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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Schedule of Common or Related Party Transactions

For the years ended December 31, 2018, 2017 and 2016, the amount of sales to common or related parties as well as the purchases from and rent expense paid to common or related parties were as follows (in thousands):

 

     Years ended December 31,  
     2018      2017      2016  

Sales

   $ 12,636      $ 10,250      $ 7,914  

Purchases

     1,587        1,294        579  

Rent

     1,099        1,154        635