Commitments And Contingencies (Changes To Warranty Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency Accrual, Period Increase (Decrease)		$ 32,600
Charges related to contractual dispute	$ 15,000	20,000
Changes to warranty liabilities [Roll Forward]
Warranty liabilities, beginning of period	61,179	65,389	$ 63,992
Warranty reserves provided	67,169	52,684	51,348
Payments	(55,892)	(60,968)	(47,968)
Other adjustments	(6,322)	4,074	(1,983)
Warranty liabilities, end of period	$ 66,134	$ 61,179	$ 65,389