Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventories:

Components of inventories

The components of inventories are summarized below (in thousands):

	March 31,		December 31,
	2018		2017
Inventories:
Raw materials	$	25,626	$	23,554
Work in process		23,805		20,135
Finished goods		1,691		2,151
	$	51,122	$	45,840