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Borrowings - Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Non-current      
Non-current portion of non-current notes and debentures issued $ 496,564 $ 496,118  
Non-current 780,202 718,484  
Current      
Current notes and debentures issued and current portion of non-current notes and debentures issued 8,250 8,250  
Current 188,078 143,632  
Borrowings 968,280 862,116 $ 817,958
Bank overdrafts      
Current      
Current 27 2,320  
Bank borrowings      
Non-current      
Non-current 283,638 221,971  
Current      
Current 179,801 132,862  
Obligations under finance leases      
Non-current      
Non-current 0 395  
Current      
Current $ 0 $ 200