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Related Party Transactions (Tables)
6 Months Ended
Jun. 30, 2019
Related Party Transactions [Abstract]  
Schedule of Common or Related Party Transactions
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,
 
 
2019
   
2018
   
2019
   
2018
 
Sales
  $
3,261
    $
3,209
    $
5,922
    $
6,102
 
Purchases
   
470
     
472
     
858
     
835
 
Rent
   
257
     
291
     
517
     
572