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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at December 31 consisted of the following (in thousands):
 
2018
 
2017
Raw material
$
57,845

 
$
42,661

Work-in-process
6,930

 
10,598

Finished goods
34,138

 
33,113

Total inventories
$
98,913

 
$
86,372
Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory
The following table summarizes activity recorded within the reserve for excess, obsolete and slow moving inventory for the years ended December 31 (in thousands):
 
2018
 
2017
 
2016
Beginning balance
$
3,695

 
$
3,801

 
$
7,428

Excess, obsolete and slow moving inventory expense
729

 
1,276

 
(239
)
Scrapped inventory and other adjustments
(252
)
 
(1,382
)
 
(3,388
)
Ending balance
$
4,172

 
$
3,695

 
$
3,801