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Financial risk management - Maturity Analysis Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables $ 98,420 $ 96,167
Borrowings 1,188,962 1,188,542
Leases Liabilities 309,082  
Derivative financial instruments 1,423 283
Total 1,597,887 1,284,992
Less than 1 year    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 94,821 95,956
Borrowings 122,403 190,671
Leases Liabilities 46,370  
Derivative financial instruments 1,423 258
Total 265,017 286,885
Between 1 and 2 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 3,399 6
Borrowings 154,682 74,478
Leases Liabilities 52,372  
Derivative financial instruments 0 25
Total 210,453 74,509
Between 2 and 5 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 30 18
Borrowings 230,058 286,557
Leases Liabilities 89,259  
Derivative financial instruments 0 0
Total 319,347 286,575
Over 5 Years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 170 187
Borrowings 681,819 636,836
Leases Liabilities 121,081  
Derivative financial instruments 0 0
Total $ 803,070 $ 637,023