Disclosures About Fair Value of Financial Instruments (Details) Gain (Loss) Recognized in Income on Derivative (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives			$ 1,883
Cost of Sales, Canola Oil and Meal
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	(2,482)		(964)
Futures | Cost of Sales, Canola Oil and Meal
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	(2,458)	[1]	(1,337)	[1]
Futures | Operating and Other Costs
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives			(708)	[2]
Forwards | Cost of Sales, Canola Oil and Meal
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	329	[1]	(298)	[1]
Forwards | Operating and Other Costs
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives			707	[2]
Swaps | Cost of Sales, Canola Oil and Meal
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	(353)	[1]	671	[1]
Swaps | Operating and Other Costs
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives			$ 1,884	[2]

[1] Represents the activity post-completion of the Company’s canola processing plant.

[2] Represents the activity pre-completion of the Company’s canola processing plant.