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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories:      
Raw materials $ 73,349 $ 39,434 $ 54,469
Work in process 109,091 85,852 52,379
Finished goods 68,888 48,865 49,263
Total $ 251,328 $ 174,151 $ 156,111