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Borrowings - Schedule of borrowings (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-current      
Non-current portion of non-current notes and debentures issued $ 495,707,000 $ 0  
Non-current 663,060,000 430,304,000  
Current      
Current notes and debentures issued and current portion of non-current notes and debentures issued 8,250,000 0  
Current 154,898,000 205,092,000  
Borrowings 817,958,000 635,396,000 $ 723,339,000
Collateralized liabilities 637,306 525,663  
Bank overdrafts      
Current      
Current 6,214,000 90,000  
Bank borrowings      
Non-current      
Non-current 167,315,000 430,202,000  
Current      
Current 140,367,000 204,923,000  
Obligations under finance leases      
Non-current      
Non-current 38,000 102,000  
Current      
Current $ 67,000 $ 79,000