Inventories (Tables)

6 Months Ended

Jun. 30, 2016

Inventory Disclosure [Abstract]

Inventories

	June 30, 2016			December 31, 2015
	(in thousands)
Raw materials	$	36,442		$	33,853
Work in process	2,417			2,522
Finished goods	2,331			2,881
	41,190			39,256
Less:  Allowance for excess and obsolete inventories	(1,065		)	(757		)
Total, net	$	40,125		$	38,499

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, 2016		June 30, 2015		June 30, 2016		June 30, 2015
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	894	$	755	$	757	$	714
Provisions for excess and obsolete inventories	171		18		308		59
Inventories written off	—		—		—		—
Balance, end of period	$	1,065	$	773	$	1,065	$	773