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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Common or Related Party Transactions

For the years ended December 31, 2017, 2016 and 2015, 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,  
     2017      2016      2015  

Sales

   $ 10,250      $ 7,914      $ 6,720  

Purchases

     1,294        579        480  

Rent

     1,154        635        598