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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total revenue $ 157,272 $ 176,568 $ 309,252 $ 342,437
Products        
Total revenue 52,530 65,741 103,447 128,368
Materials        
Total revenue 41,228 45,044 82,658 87,863
Services        
Total revenue $ 63,514 $ 65,783 $ 123,147 $ 126,206