Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Inventories

The components of inventories are as follows:

	June 30, 2019			December 31, 2018
	(in thousands)
Raw materials	$	71,348		$	67,995
Work in process	3,133			4,060
Finished goods	4,913			6,767
	79,394			78,822
Less:  Allowance for excess and obsolete inventories	(2,350		)	(1,210		)
Total, net	$	77,044		$	77,612

Inventories (Allowance)

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

	Three months ended						Six months ended
	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	1,567		$	1,209		$	1,210		$	1,118
Provisions for excess and obsolete inventories	796			217			1,153			318
Inventories written off	(13		)	(19		)	(13		)	(29		)
Balance, end of period	$	2,350		$	1,407		$	2,350		$	1,407