XML 77 R54.htm IDEA: XBRL DOCUMENT v3.19.3
Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product And Service) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total revenue $ 155,272 $ 164,511 $ 464,524 $ 506,948
Products        
Total revenue 53,117 59,648 156,564 188,016
Materials        
Total revenue 41,389 40,274 124,047 128,137
Services        
Total revenue $ 60,766 $ 64,589 $ 183,913 $ 190,795