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Other Current Liabilities (Changes In Product Warranty Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Current Liabilities [Abstract]      
Beginning of year $ 1,300 $ 1,102 $ 1,113
Accruals 2,930 2,222 1,823
Usage (2,516) (2,024) (1,834)
Balance at end of year $ 1,714 $ 1,300 $ 1,102