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Product Warranties (Summary Of Product Warranty Activity) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 47,517 $ 33,978
Provision for warranty accrual 19,050 20,284
Warranty claims (13,827) (11,746)
Foreign currency translation (1,057) 2,459
Balance at September 30 $ 51,683 $ 44,975