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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and supplies $ 30,687 $ 21,275
Work-in-process 19,821 32,709
Finished goods 23,494 6,903
Total inventories $ 74,002 $ 60,887