Summary of Significant Accounting Policies (Changes In Warranty And Safety Recall Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of period	$ 74,217	$ 69,250	$ 64,120
Warranties issued during the period	60,215	59,259	60,331
Settlements made during the period	(99,298)	(96,529)	(74,262)
Recalls and changes to pre-existing warranty liabilities	44,348	42,237	19,061
Balance, end of period	$ 79,482	$ 74,217	$ 69,250