Summary Of Significant Accounting Policies (Changes In Warranty And Safety Recall Liability) (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, beginning of period	$ 54,134	$ 68,044	$ 64,543
Warranties issued during the period	44,092	36,785	51,336
Settlements made during the period	(55,386)	(58,067)	(74,022)
Recalls and changes to pre-existing warranty liabilities	12,154	7,372	26,187
Balance, end of period	$ 54,994	$ 54,134	$ 68,044