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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 283,267 $ 233,187 $ 191,680
Work in process 12,659 10,408 10,562
Finished goods 29,893 31,153 27,521
Inventories, net $ 325,819 $ 274,748 $ 229,763