Inventories (Tables)

6 Months Ended

Jun. 30, 2022

Inventory Disclosure [Abstract]

Inventories

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

	June 30, 2022		December 31, 2021
	(in thousands)
Raw materials	$	156,265	$	124,480
Work in process	3,534		3,049
Finished goods	6,073		4,528
Total, gross	165,872		132,057
Less:  Allowance for excess and obsolete inventories	(1,871)		(1,787)
Total, net	$	164,001	$	130,270

Inventories (Allowance)

	Three Months Ended				Six Months Ended
	June 30, 2022		June 30, 2021		June 30, 2022		June 30, 2021
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	2,007	$	2,304	$	1,787	$	3,261
Provision for (recovery of) excess and	(72)		486		148		292
obsolete inventories
Inventories written off	(64)		(64)		(64)		(827)
Balance, end of period	$	1,871	$	2,726	$	1,871	$	2,726