Inventories (Tables)

9 Months Ended

Sep. 30, 2014

Inventory Disclosure [Abstract]

Inventories

	September 30, 2014			December 31, 2013
	(in thousands)
Raw materials	$	33,694		$	28,592
Work in process	2,249			2,286
Finished goods	2,099			1,841
	38,042			32,719
Less:  Allowance for excess and obsolete inventories	(802		)	(579		)
Total, net	$	37,240		$	32,140

Inventories (Allowance)

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

	Three months ended				Nine months ended
	September 30, 2014		September 30, 2013		September 30, 2014		September 30, 2013
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	735	$	537	$	579	$	363
Provisions for excess and obsolete inventories	67		267		223		468
Inventories written off	—		—		—		(27		)
Balance, end of period	$	802	$	804	$	802	$	804