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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following (in thousands):
 
June 30,
 
December 31,
 
2019
 
2018
Raw material and subassemblies
$
220,526

 
$
214,164

Work-in-progress
50,179

 
43,096

Finished goods
124,038

 
94,847

 
$
394,743

 
$
352,107