Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Finished goods $ 46,729 $ 36,968
Work-in-process 5,194 1,677
Raw materials and supplies 6,215 6,765
Inventories $ 58,138 $ 45,410