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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials and supplies $ 74,428 $ 76,680
Work in process 33,096 33,721
Finished goods 96,342 88,901
Inventories, net 203,866 199,302
Inventory Valuation Reserves $ 11,146 $ 11,269