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Accrued Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Product Warranties Disclosures [Abstract]    
Balance at beginning of the period $ 3,335 $ 3,044
Provision charged to cost of revenue 310 429
Acquisition related warranty accrual   94
Use of provision (393) (342)
Reclassification to liabilities held for sale   (376)
Foreign currency exchange rate changes (4) (24)
Balance at end of period $ 3,248 $ 2,825