Warranty (Schedule Of Accrued Warranty Obligation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Warranty [Abstract]
Balance at the beginning of the year	$ 4,613	$ 4,554
Warranty expense	1,068	1,011
Warranty payments	(1,792)	(1,426)
Balance at the end of the period	$ 3,889	$ 4,139