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Disclosure of leases and similar arrangements - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2014
Disclosure of recognised finance lease as assets by lessee [line items]          
Lease expense   $ 1,659,000 $ 1,381,000 $ 1,443,000  
Average contract term (in years)   5 years      
Minimum operating lease payments recognised as expense   $ 41,100,000 64,900,000 53,400,000  
Minimum finance lease payments payable   $ 105 181    
Lease term (in years)   10 years      
Minimum lease payments receivable under cancellable operating lease   $ 1,518,000 1,482,000    
Settlement gain, net   0 8,489,000 0  
Lease Expense Capitalized          
Disclosure of recognised finance lease as assets by lessee [line items]          
Lease expense   14,000,000 6,800,000 $ 10,800,000  
Marfrig Argentina S.A.          
Disclosure of recognised finance lease as assets by lessee [line items]          
Minimum lease payments receivable under cancellable operating lease         $ 500,000
Arbitration proceedings settlement amount $ 9,000,000        
Arbitration proceedings settlement amount collected     $ 7    
Settlement gain, net   $ 8,500,000