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Inventories (Schedule Of Inventory Costs) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 310,972 $ 258,228
Work in process 7,071 8,600
Finished goods 943 2,089
Inventories $ 318,986 $ 268,917