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

For the three and nine months ended September 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 September 30,      Nine months ended September 30,  
     2018      2017      2018      2017  

Sales

   $ 3,259      $ 2,641      $ 9,361      $ 7,363  

Purchases

     372        302        1,207        901  

Rent

     257        290        829        875