Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Finished goods $ 51,626 $ 46,729
Work-in-process 6,221 5,194
Raw materials and supplies 7,086 6,215
Inventories $ 64,933 $ 58,138