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Commitments And Contingencies (Changes To Warranty Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes to warranty liabilities [Roll Forward]      
Warranty liabilities, beginning of period $ 66,134 $ 61,179 $ 65,389
Warranty reserves provided 50,014 67,169 52,684
Payments (58,780) (55,892) (60,968)
Other adjustments 15,341 (6,322) 4,074
Warranty liabilities, end of period $ 72,709 $ 66,134 $ 61,179