Commitments And Contingencies (Schedule Of Changes In Accrued Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Abstract]
Balance, beginning of period	$ 34,947	$ 19,611
Warranties issued	48,458	53,404
Settlements	(44,287)	(35,024)
Net changes in liability for pre-existing warranties, including expirations	(5,003)	(3,044)
Balance, end of period	34,115	34,947
Less: Long-term portion	(5,859)	(5,435)
Accrued warranty, current	$ 28,256	$ 29,512