Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

(4) Inventories

Components of inventories at March 31, 2019 and December 31, 2018 are summarized as follows:

(in thousands)	2019		2018
Raw materials	$	50,840	$	49,624
Work in process	5,900		2,969
Finished goods and parts	81,179		80,568
Inventories	$	137,919	$	133,161