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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 73,557 $ 80,408
Work in process 133,612 136,858
Finished goods 75,101 78,196
Inventories, net $ 282,270 $ 295,462