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Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
A summary of inventories follows (in thousands):

        
 
September 30, 2017
 
December 31, 2016
Finished product
$
184,778

 
$
156,542

Work in process
100,147

 
87,284

Raw material
37,609

 
39,859

Supplies and other
52,564

 
47,130

 
$
375,098

 
$
330,815