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Inventories (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of carrying values of inventories
Inventories consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2014
 
2013
 
2013
Raw materials
$
90,541

 
$
85,490

 
$
81,338

In-process products
20,810

 
18,759

 
18,475

Finished products
107,685

 
91,998

 
97,915

 
$
219,036

 
$
196,247

 
$
197,728