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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 02, 2016
Oct. 04, 2015
Oct. 02, 2016
Oct. 04, 2015
Warranty reserve activity        
Balance beginning of period $ 10,396 $ 10,810 $ 10,922 $ 10,783
Provision charged to income 4,038 4,240 11,890 12,728
Payments (3,905) (4,412) (12,189) (12,158)
Adjustments to previously provided warranties, net (459) 129 (740) (342)
Foreign currency translation and acquisitions 30 (155) 217 (399)
Balance end of period $ 10,100 $ 10,612 $ 10,100 $ 10,612