Summary Of Significant Accounting Policies (Changes In Warranty And Safety Recall Liability) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Balance, beginning of period	$ 54,994	$ 54,134	$ 68,044
Warranties issued during the period	54,394	44,092	36,785
Settlements made during the period	(67,247)	(55,386)	(58,067)
Recalls and changes to pre-existing warranty liabilities	18,122	12,154	7,372
Balance, end of period	$ 60,263	$ 54,994	$ 54,134