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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Components Of Inventories
(in thousands)
2018
 
2017
Raw materials
$
42,673

 
$
37,660

Work in process
4,247

 
3,906

Finished goods and parts
67,573

 
62,337

Inventories
$
114,493

 
$
103,903