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Inventories (Schedule Of Inventory Costs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 311,190 $ 258,228
Work in process 7,985 8,600
Finished goods 2,019 2,089
Inventories $ 321,194 $ 268,917