Inventories

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories are valued at the lower of cost or net realizable value. Cost is determined by the first-in, first-out (“FIFO”) method. We establish an allowance for excess and obsolete inventories based on product line changes, the feasibility of substituting parts and the need for supply and replacement parts.

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

	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