Inventories (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021		December 31, 2020
	(in thousands)
Raw materials	$	85,514	$	76,238
Work in process	1,557		2,088
Finished goods	3,054		7,154
Total, gross	90,125		85,480
Less:  Allowance for excess and obsolete inventories	(2,726)		(3,261)
Total, net	$	87,399	$	82,219

Inventories (Allowance)

	Three Months Ended				Six Months Ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	2,304	$	2,365	$	3,261	$	2,644
Provisions (recoveries) for excess and	486		81		292		(193)
obsolete inventories
Inventories written off	(64)		(73)		(827)		(78)
Balance, end of period	$	2,726	$	2,373	$	2,726	$	2,373