Summary Of Significant Accounting Policies (Warranty Reserve Activity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]
Balance at beginning of period	$ 34,704	$ 59,022	$ 89,318
Expense provisions	4,224	5,320	7,188
Cash payments	(7,925)	(8,793)	(9,701)
Adjustments	(5,478)	(20,845)	(27,783)
Balance at end of period	$ 25,525	$ 34,704	$ 59,022