Inventories (Tables)

6 Months Ended

Jun. 30, 2015

Inventory Disclosure [Abstract]

Inventories

	June 30, 2015			December 31, 2014
	(in thousands)
Raw materials	$	43,647		$	34,153
Work in process	1,945			2,262
Finished goods	2,363			1,917
	47,955			38,332
Less:  Allowance for excess and obsolete inventories	(773		)	(714		)
Total, net	$	47,182		$	37,618

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, 2015		June 30, 2014		June 30, 2015		June 30, 2014
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	755	$	583	$	714	$	579
Provisions for excess and obsolete inventories	18		152		59		156
Inventories written off	—		—		—		—
Balance, end of period	$	773	$	735	$	773	$	735