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Product Warranty (Reconciliation Of Product Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reconciliation of Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 13,186 $ 12,339
Provision for warranty claims 1,791 1,248
Warranty claims (1,723) (1,589)
Other (76) 68
Balance at end of period $ 13,178 $ 12,066