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Inventories
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories at the dates indicated consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2018
 
2017
 
2017
Raw materials
$
96,338

 
$
101,102

 
$
91,022

In-process products
27,847

 
28,098

 
26,849

Finished products
133,995

 
136,093

 
135,125

 
$
258,180

 
$
265,293

 
$
252,996