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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Warranty reserve activity        
Balance beginning of period $ 8,943 $ 9,088 $ 9,050 $ 9,012
Provision charged to income 3,327 3,326 10,012 9,706
Payments (3,547) (3,488) (10,514) (10,625)
Adjustments to previously provided warranties, net (226) (730) 110 (215)
Foreign currency translation and acquisitions (49) 117 (210) 435
Balance end of period $ 8,448 $ 8,313 $ 8,448 $ 8,313