Inventories (Tables)

6 Months Ended

Jun. 30, 2014

Inventory Disclosure [Abstract]

Inventories

	June 30, 2014			December 31, 2013
	(in thousands)
Raw materials	$	32,750		$	28,592
Work in process	2,267			2,286
Finished goods	2,326			1,841
	37,343			32,719
Less:  Allowance for excess and obsolete inventories	(735		)	(579		)
Total, net	$	36,608		$	32,140

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, 2014		June 30, 2013		June 30, 2014		June 30, 2013
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	583	$	532	$	579	$	363
Provisions for excess and obsolete inventories	152		5		156		201
Inventories written off	—		—		—		(27		)
Balance, end of period	$	735	$	537	$	735	$	537