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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
(4) Inventories

Components of inventories at September 30, 2019 and December 31, 2018 are summarized as follows:
(in thousands)20192018
Raw materials$49,130  $49,624  
Work in process5,941  2,969  
Finished goods and parts67,635  80,568  
Inventories$122,706  $133,161