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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Inventories:          
Raw materials and supplies $ 50,472   $ 50,472   $ 54,469
Work in process 69,237   69,237   52,379
Finished goods 44,715   44,715   49,263
Total 164,424   164,424   $ 156,111
Inventory write-downs $ 212 $ 3,504 $ 1,509 $ 14,625