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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials and supplies $ 76,831 $ 76,680
Work in process 32,331 33,721
Finished goods 82,519 88,901
Inventories, net 191,681 199,302
Inventory Valuation Reserves $ 8,197 $ 11,269