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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Components of Inventories
Components of inventories, net, at December 31, 2018 and 2017 are as follows:
(in thousands)
 
2018
 
2017
Raw materials
 
$
49,624

 
$
37,660

Work in process
 
2,969

 
3,906

Finished goods and parts
 
80,568

 
62,337

Inventories, net
 
$
133,161

 
$
103,903