Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

v3.8.0.1
Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Inventories [Abstract]    
Raw materials $ 21,221 $ 20,737
Work in progress 9,616 8,461
Finished goods 37,291 33,720
Inventories $ 68,128 $ 62,918