Inventories (Tables)

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories

The components of inventories are as follows:

	September 30, 2019		December 31, 2018
	(in thousands)
Raw materials	$	74,950	$	67,995
Work in process	2,271		4,060
Finished goods	5,602		6,767
Total, gross	82,823		78,822
Less:  Allowance for excess and obsolete inventories	(2,200)		(1,210)
Total, net	$	80,623	$	77,612

Inventories (Allowance)

The related changes in the allowance for excess and obsolete inventories account are as follows:

	Three months ended				Nine months ended
	September 30, 2019		September 30, 2018		September 30, 2019		September 30, 2018
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	2,350	$	1,407	$	1,210	$	1,118
Provisions for excess and obsolete inventories	(150)		(263)		1,003		55
Inventories written off	—		(30)		(13)		(59)
Balance, end of period	$	2,200	$	1,114	$	2,200	$	1,114