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Related Party Transactions (Tables)
6 Months Ended
Jun. 30, 2018
Related Party Transactions [Abstract]  
Schedule of Common or Related Party Transactions

For the three and six months ended June 30, 2018 and 2017, the amount of sales to related parties as well as the purchases from and rent expense paid to related parties were as follows (in thousands):

 

     Three months ended June 30,      Six months ended June 30,  
     2018      2017      2018      2017  

Sales

   $ 3,209      $ 2,386      $ 6,102      $ 4,722  

Purchases

     472        308        835        599  

Rent

     291        289        572        585