Inventories (Tables)

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Inventories

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

	September 30, 2020		December 31, 2019
	(in thousands)
Raw materials	$	76,673	$	68,842
Work in process	1,541		1,825
Finished goods	4,717		5,578
Total, gross	82,931		76,245
Less:  Allowance for excess and obsolete inventories	(4,112)		(2,644)
Total, net	$	78,819	$	73,601

Inventories (Allowance)

	Three Months Ended				Nine Months Ended
	September 30, 2020		September 30, 2019		September 30, 2020		September 30, 2019
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	2,373	$	2,350	$	2,644	$	1,210
Provisions (recoveries) for excess and	1,969		(150)		1,776		1,003
obsolete inventories
Inventories written off	(230)		—		(308)		(13)
Balance, end of period	$	4,112	$	2,200	$	4,112	$	2,200