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Product Warranties (Summary Of Product Warranty Activity) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 48,866 $ 51,422
Provision for warranty accrual 16,255 16,916
Warranty claims (20,992) (17,399)
Foreign currency translation 822 (1,077)
Balance at September 30 $ 44,951 $ 49,862