Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventories [Abstract]    
Finished goods $ 46,157 $ 36,968
Work-in-process 1,108 1,677
Raw materials and supplies 7,547 6,765
Inventories $ 54,812 $ 45,410