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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Finished goods $ 36,360 $ 43,117
Work-in-process 2,036 1,730
Raw materials and supplies 6,854 6,649
Inventories $ 45,250 $ 51,496