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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Components Of Inventories
(in thousands)
2018
 
2017
Raw materials
$
39,124

 
$
37,660

Work in process
3,950

 
3,906

Finished goods and parts
67,309

 
62,337

Inventories
$
110,383

 
$
103,903