Commitments And Contingencies Schedule of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of beginning of the period	$ 40,967	$ 41,934	$ 44,888	$ 48,754
Provision for warranty liability made during the period	22,625	17,175	53,862	44,630
Settlements made during the period	(15,664)	(16,357)	(50,822)	(50,632)
Balance at end of period	$ 47,928	$ 42,752	$ 47,928	$ 42,752