Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details) (Illinois Corn Processing LLC [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in affiliates (included in Investments, at Equity, and Advances to 50% or Less Owned Companies)	$ 0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in affiliates (included in Investments, at Equity, and Advances to 50% or Less Owned Companies)	30,916	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in affiliates (included in Investments, at Equity, and Advances to 50% or Less Owned Companies)	$ 0

[1] During the nine months ended September 30, 2012, the Company marked its equity investment in its Illinois Corn Processing LLC ("ICP") joint venture to fair value following the acquisition of a controlling interest (see Note 6). The investment's fair value was determined based on a fair value analysis of the assets and liabilities of ICP.