Derivatives (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivatives (Textual) [Abstract]
Foreign currency collar	$ 6.8
Maximum period in which contracts for the sale of grain to processors or other consumers extend	1 year
Estimated fair value of inventory	1.0	27.3
Amount reclassified from accumulated and other comprehensive income	0.1	0.1	0.1
Amount to be reclassified from accumulated and other comprehensive income in next twelve months	0.1
Foreign Currency Derivatives, Exchange rate floor	0.9875
Foreign Currency Derivatives, Exchange rate cap		1.069
Number of swaptions	2
Amount on swaptions	$ 10