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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Finished goods $ 246,079 $ 243,488
Work in process 36,020 35,714
Raw materials, supplies and other 28,242 30,733
Inventory, net $ 310,341 $ 309,935