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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Finished goods $ 143,665 $ 146,269
Commodities held for sale 42,639 65,693
Raw materials 104,119 144,520
Work-in-process 298,738 320,664
Supplies and parts 36,141 34,732
Inventories $ 625,302 $ 711,878