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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and work-in-process $ 271,645 $ 266,072
Finished goods 102,039 101,585
Company-owned grain 7,675 15,027
Inventory reserves (10,760) (14,202)
Total Inventory, Net $ 370,599 $ 368,482