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Product Warranties (Summary of Product Warranty Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 45,669 $ 48,866
Provision for warranty accrual 8,403 5,001
Warranty claims (7,446) (7,241)
Foreign currency translation (1,382) (822)
Balance at March 31 $ 45,244 $ 45,804