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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished goods $ 253,632 $ 211,426
Work in process 37,009 34,091
Raw materials, supplies and other 39,477 42,556
Inventory, net $ 330,118 $ 288,073