Warranty Reserves (Summary Of Changes In Accrued Warranty Reserves) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Warranty Reserves [Abstract]
Balance, beginning of year	$ 1,693	$ 2,196
Provision for warranty expense	2,321	2,507
Change in estimate, balance beginning of year	(92)	(395)
Settlement of warranty liability	(2,339)	(2,615)
Balance, end of year	$ 1,583	$ 1,693