Product Warranties (Schedule Of Product Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of beginning of the period	$ 48,754	$ 46,659
Provision for warranty liability made during the period	14,158	16,375
Settlements made during the period	(17,509)	(17,158)
Balance at end of period	$ 45,403	$ 45,876