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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Warranty reserve activity    
Balance beginning of period $ 9,012 $ 9,843
Provision charged to income 2,989 3,659
Payments (3,725) (3,915)
Adjustments to previously provided warranties, net 539 (67)
Foreign currency translation and acquisitions 122 231
Balance end of period $ 8,937 $ 9,751