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Commitments And Contingencies Schedule of Product Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance as of beginning of the period $ 42,877 $ 45,403 $ 44,888 $ 48,754
Provision for warranty liability made during the period 14,982 13,297 31,237 27,455
Settlements made during the period (16,892) (16,766) (35,158) (34,275)
Balance at end of period $ 40,967 $ 41,934 $ 40,967 $ 41,934