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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and supplies $ 31,239 $ 21,275
Work-in-process 24,459 32,709
Finished goods 25,462 6,903
Total inventories $ 81,160 $ 60,887