Inventories

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

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

	December 31,
	2021		2020
	(in thousands)
Raw materials	$	124,480	$	76,238
Work in process	3,049		2,088
Finished goods	4,528		7,154
	132,057		85,480
Less:  Allowance for excess and obsolete inventories	(1,787)		(3,261)
Total, net	$	130,270	$	82,219

 

	Years Ended December 31,
	2021		2020		2019
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	3,261	$	2,644	$	1,210
Provisions for excess and obsolete inventories	629		1,108		1,454
Inventories written off	(2,103)		(491)		(20)
Balance, end of period	$	1,787	$	3,261	$	2,644