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Inventories (Schedule Of Inventory Costs) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 261,328 $ 233,111
Work in process 106,512 113,496
Finished goods 36,183 34,727
Inventories $ 404,023 $ 381,334