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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Components Of Inventories
Components of inventories at September 30, 2018 and December 31, 2017 are summarized as follows:
(in thousands)
2018
 
2017
Raw materials
$
50,533

 
$
37,660

Work in process
4,318

 
3,906

Finished goods and parts
73,313

 
62,337

Inventories
$
128,164

 
$
103,903