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Trade and Finance Receivables - Finance Receivables Allowance (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2013
Dec. 31, 2012
Grower receivables      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Reserve at beginning of period $ 32,074    
Reserve at end of period 31,660    
Iranian customers | Customer not able to find acceptable methods of payment      
Valuation Allowance [Line Items]      
Reserve for trade receivables $ 2,000 $ 2,000 $ 9,000