Annual report pursuant to Section 13 and 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories [Abstract]    
Finished goods $ 36,968 $ 43,117
Work-in-process 1,677 1,730
Raw materials and supplies 6,765 6,649
Inventories $ 45,410 $ 51,496