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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Inventories:      
Raw materials and supplies $ 51,037   $ 54,469
Work in process 60,979   52,379
Finished goods 47,377   49,263
Total 159,393   $ 156,111
Inventory write-downs $ 1,297 $ 11,537