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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
 
June 30,
2018
 
December 31, 2017
 
(in thousands)
Raw materials
$
62,272

 
$
57,784

Work in process
3,414

 
5,957

Finished goods
6,188

 
8,163

 
71,874

 
71,904

Less:  Allowance for excess and obsolete inventories
(1,407
)
 
(1,118
)
Total, net
$
70,467

 
$
70,786
Inventories (Allowance)
The related changes in the allowance for excess and obsolete inventories account are as follows:

  
Three months ended
 
Six months ended
 
June 30,
2018
 
June 30,
2017
 
June 30,
2018
 
June 30,
2017
Allowance for excess and obsolete inventories:
(in thousands)
Balance, beginning of period
$
1,209

 
$
1,442

 
$
1,118

 
$
1,382

Provisions for excess and obsolete inventories
217

 
200

 
318

 
260

Inventories written off
(19
)
 
—

 
(29
)
 
—

Balance, end of period
$
1,407

 
$
1,642

 
$
1,407

 
$
1,642