Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 27,219 $ 26,186
Work in progress 8,692 9,455
Finished goods 33,769 29,169
Inventories $ 69,680 $ 64,810