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Product Warranties (Summary Of Product Warranty Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 33,978 $ 28,210
Provision for warranty accrual 4,523 4,814
Warranty claims (2,966) (3,562)
Foreign currency translation 438 780
Balance at March 31 $ 35,973 $ 30,242