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Inventories (Tables)
 9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
 
September 30,
2015
 
December 31, 2014
 
(in thousands)
Raw materials
$
36,571

 
$
34,153

Work in process
2,684

 
2,262

Finished goods
2,400

 
1,917

 
41,655

 
38,332

Less:  Allowance for excess and obsolete inventories
(603
)
 
(714
)
Total, net
$
41,052

 
$
37,618
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,
2015
 
September 30,
2014
 
September 30,
2015
 
September 30,
2014
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
773

 
$
735

 
$
714

 
$
579

Provisions for excess and obsolete inventories
(35
)
 
67

 
24

 
223

Inventories written off
(135
)
 
—

 
(135
)
 
—

Balance, end of period
$
603

 
$
802

 
$
603

 
$
802