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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of components of inventories The components of inventories consisted of the following:

 
December 31,
 (in thousands) 
2018
 
2017
Raw materials
$
98,058

 
$
91,022

In-process products
24,645

 
26,849

Finished products
153,385

 
135,125

 
$
276,088

 
$
252,996