Trade and Finance Receivables - Finance Receivables Allowance (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Grower receivables
Allowance for Doubtful Accounts Receivable [Roll Forward]
Reserve at beginning of period			$ 32,040,000	$ 32,074,000	$ 32,877,000
Reserve at end of period			32,040,000	32,074,000	32,877,000
Iranian customers | Customer not able to find acceptable methods of payment
Valuation Allowance [Line Items]
Reserve for trade receivables	$ 2,000,000	$ 9,000,000