Inventories

6 Months Ended

Jun. 30, 2020

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, 2020		December 31, 2019
	(in thousands)
Raw materials	$	79,902	$	68,842
Work in process	2,275		1,825
Finished goods	5,607		5,578
Total, gross	87,784		76,245
Less:  Allowance for excess and obsolete inventories	(2,373)		(2,644)
Total, net	$	85,411	$	73,601

	Three Months Ended				Six Months Ended
	June 30, 2020		June 30, 2019		June 30, 2020		June 30, 2019
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	2,365	$	1,567	$	2,644	$	1,210
Provisions (recoveries) for excess and	81		796		(193)		1,153
obsolete inventories
Inventories written off	(73)		(13)		(78)		(13)
Balance, end of period	$	2,373	$	2,350	$	2,373	$	2,350