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Inventories
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories

The components of inventories and the related changes in the allowance for excess and obsolete inventories are as follows:
 
 
December 31,
 
2016
 
2015
 
(in thousands)
Raw materials
$
43,438

 
$
33,853

Work in process
2,279

 
2,522

Finished goods
3,017

 
2,881

 
48,734

 
39,256

Less:  Allowance for excess and obsolete inventories
(1,382
)
 
(757
)
Total, net
$
47,352

 
$
38,499


  
 
Years Ending December 31,
 
2016
 
2015
 
2014
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
757

 
$
714

 
$
579

Provisions for excess and obsolete inventories
625

 
178

 
135

Inventories written off
—

 
(135
)
 
—

Balance, end of period
$
1,382

 
$
757

 
$
714