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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
 
March 31,
2017
 
December 31, 2016
 
(in thousands)
Raw materials
$
52,268

 
$
43,438

Work in process
1,836

 
2,279

Finished goods
3,326

 
3,017

 
57,430

 
48,734

Less:  Allowance for excess and obsolete inventories
(1,442
)
 
(1,382
)
Total, net
$
55,988

 
$
47,352
Inventories (Allowance)
The related changes in the allowance for excess and obsolete inventories account are as follows:

  
Three months ended
 
March 31,
2017
 
March 31,
2016
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
1,382

 
$
757

Provisions for excess and obsolete inventories
60

 
137

Inventories written off
—

 
—

Balance, end of period
$
1,442

 
$
894