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Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 15,250 $ 16,227  
Accruals for warranties issued during period 15,197 14,762  
Adjustments related to pre-existing warranties (298) 359  
Settlements made during the period (15,424) (15,379)  
Balance at end of period 14,725 $ 15,969  
Current - in the next twelve months 8,958   $ 6,975
Long-term - beyond one year $ 5,767   $ 8,275