Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventories

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

	March 31, 2021		December 31, 2020
	(in thousands)
Raw materials	$	78,830	$	76,238
Work in process	2,577		2,088
Finished goods	4,937		7,154
Total, gross	86,344		85,480
Less:  Allowance for excess and obsolete inventories	(2,304)		(3,261)
Total, net	$	84,040	$	82,219

Inventories (Allowance)

	Three Months Ended
	March 31, 2021		March 31, 2020
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	3,261	$	2,644
(Recoveries) provisions for excess and	(194)		(274)
obsolete inventories
Inventories written off	(763)		(5)
Balance, end of period	$	2,304	$	2,365