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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
 
September 30,
2018
 
December 31, 2017
 
(in thousands)
Raw materials
$
65,694

 
$
57,784

Work in process
6,116

 
5,957

Finished goods
8,486

 
8,163

 
80,296

 
71,904

Less:  Allowance for excess and obsolete inventories
(1,114
)
 
(1,118
)
Total, net
$
79,182

 
$
70,786
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,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
1,407

 
$
1,642

 
$
1,118

 
$
1,382

Provisions for excess and obsolete inventories
(263
)
 
(206
)
 
55

 
54

Inventories written off
(30
)
 
(243
)
 
(59
)
 
(243
)
Balance, end of period
$
1,114

 
$
1,193

 
$
1,114

 
$
1,193