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Warranty Reserves (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance - beginning of period $ 36,827 $ 37,233
Accrual for products sold during the period 10,012 8,200
Expenditures (11,417) (11,006)
Balance - end of period $ 35,422 $ 34,427