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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories

Inventories consist of the following at:

 

   June 30,
2019
  December 31,
2018
       
Raw materials   $89,024   $109,826 
Work-in-process    26,456    30,088 
Finished goods    18,756    19,937 
Gross inventory  $134,236   $159,851 
Less obsolete reserve   (8,769)   (10,369)
Total  $125,467   $149,482