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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components of inventories
The components of inventories as of June 30, 2019 and December 31, 2018 were as follows:
 
June 30, 2019
 
December 31, 2018
Finished goods
$
179,254

 
$
187,095

Work-in-process
104,793

 
104,405

Raw materials
206,076

 
200,819

Inventories
$
490,123

 
$
492,319