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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories at the dates indicated consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2017
 
2016
 
2016
Raw materials
$
101,102

 
$
86,886

 
$
86,524

In-process products
28,098

 
24,406

 
20,902

Finished products
136,093

 
106,872

 
124,848

 
$
265,293

 
$
218,164

 
$
232,274