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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 05, 2020
Mar. 31, 2019
Warranty reserve activity    
Balance beginning of period $ 8,812 $ 8,393
Provision charged to income 2,712 2,768
Payments (3,266) (3,254)
Adjustments to previously provided warranties, net 1,052 270
Foreign currency translation and acquisitions (269) (18)
Balance end of period $ 9,041 $ 8,159