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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Components Of Inventories
Components of inventories at June 30, 2019 and December 31, 2018 are summarized as follows:
(in thousands)
2019
 
2018
Raw materials
$
49,393

 
$
49,624

Work in process
8,483

 
2,969

Finished goods and parts
76,060

 
80,568

Inventories
$
133,936

 
$
133,161