Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Finished goods $ 40,238 $ 46,729
Work-in-process 6,129 5,194
Raw materials and supplies 6,755 6,215
Inventories $ 53,122 $ 58,138