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Financial risk management - Maturity Analysis Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables $ 114,813 $ 98,420
Borrowings 1,330,116 1,188,962
Leases Liabilities 197,526 309,082
Derivative financial instruments 13,141 1,423
Total 1,655,596 1,597,887
Less than 1 year    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 114,523 94,821
Borrowings 286,588 122,403
Leases Liabilities 13,141 46,370
Derivative financial instruments 36,714 1,423
Total 450,966 265,017
Between 1 and 2 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 15 3,399
Borrowings 132,266 154,682
Leases Liabilities 20,608 52,372
Derivative financial instruments 0 0
Total 152,889 210,453
Between 2 and 5 years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 22 30
Borrowings 197,941 230,058
Leases Liabilities 74,565 89,259
Derivative financial instruments 0 0
Total 272,528 319,347
Over 5 Years    
Disclosure of Maturity Analysis for Non-Derivative and Derivative Financial Liabilities [Line Items]    
Trade and other payables 253 170
Borrowings 713,321 681,819
Leases Liabilities 65,639 121,081
Derivative financial instruments 0 0
Total $ 779,213 $ 803,070