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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
 
September 30,
2016
 
December 31, 2015
 
(in thousands)
Raw materials
$
39,713

 
$
33,853

Work in process
2,169

 
2,522

Finished goods
2,696

 
2,881

 
44,578

 
39,256

Less:  Allowance for excess and obsolete inventories
(1,177
)
 
(757
)
Total, net
$
43,401

 
$
38,499
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,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
1,065

 
$
773

 
$
757

 
$
714

Provisions for excess and obsolete inventories
112

 
(35
)
 
420

 
24

Inventories written off
—

 
(135
)
 
—

 
(135
)
Balance, end of period
$
1,177

 
$
603

 
$
1,177

 
$
603