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Borrowings - Schedule of borrowings (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-current      
Non-current portion of non-current notes and debentures issued $ 496,118,000 $ 495,707,000  
Non-current 718,484,000 663,060,000 [1] $ 430,304,000 [1]
Current      
Current notes and debentures issued and current portion of non-current notes and debentures issued 8,250,000 8,250,000  
Current 143,632,000 154,898,000 [1] 205,092,000 [1]
Borrowings 862,116,000 817,958,000 $ 635,396,000
Collateralized liabilities 87,738 136,322  
Bank overdrafts      
Current      
Current 2,320,000 6,214,000  
Bank borrowings      
Non-current      
Non-current 221,971,000 167,315,000  
Current      
Current 132,862,000 140,367,000  
Obligations under finance leases      
Non-current      
Non-current 395,000 38,000  
Current      
Current $ 200,000 $ 67,000  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.