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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished goods $ 257,415 $ 211,426
Work in process 29,120 34,091
Raw materials, supplies and other 45,581 42,556
Inventory, net $ 332,116 $ 288,073