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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets as per statement of financial position        
Trade and other receivables $ 228,378 $ 188,080    
Derivative financial instruments 5,342 1,585    
Restricted short-term investment 98,571 0    
Cash and cash equivalents 230,653 199,766 $ 336,282 $ 290,276
Total 562,944 389,431    
Liabilities as per statement of financial position        
Trade and other payables 259,607 169,030    
Borrowings 1,007,752 817,651 971,090  
Lease liabilities 337,980 246,854 $ 195,772  
Derivative financial instruments 3,057 1,283    
Total 1,608,396 1,234,818    
Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 214,990 153,459    
Borrowings 1,007,752 817,651    
Lease liabilities 337,980 246,854    
Derivative financial instruments 3,057 1,283    
Total 1,563,779 1,219,247    
Non- financial liabilities        
Liabilities as per statement of financial position        
Trade and other payables 44,617 15,571    
Borrowings 0 0    
Lease liabilities 0 0    
Derivative financial instruments 0 0    
Total 44,617 15,571    
Financial liabilities at amortized cost | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 214,990 153,459    
Borrowings 1,007,752 817,651    
Lease liabilities 337,980 246,854    
Derivative financial instruments 0 0    
Total 1,560,722 1,217,964    
Liabilities at fair value through profit or loss | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 0 0    
Borrowings 0 0    
Lease liabilities 0 0    
Derivative financial instruments 3,057 1,283    
Total 3,057 1,283    
Financial Assets Instruments        
Assets as per statement of financial position        
Trade and other receivables 108,025 101,371    
Derivative financial instruments 5,342 1,585    
Restricted short-term investment 98,571      
Cash and cash equivalents 230,653 199,766    
Total 442,591 302,722    
Financial Assets Instruments | Financial asset / liabilities at amortized cost        
Assets as per statement of financial position        
Trade and other receivables 108,025 101,371    
Derivative financial instruments 0 0    
Restricted short-term investment 0      
Cash and cash equivalents 230,653 199,766    
Total 338,678 301,137    
Financial Assets Instruments | Financial assets at fair value through profit or loss        
Assets as per statement of financial position        
Trade and other receivables 0 0    
Derivative financial instruments 5,342 1,585    
Restricted short-term investment 98,571      
Cash and cash equivalents 0 0    
Total 103,913 1,585    
Non- financial assets        
Assets as per statement of financial position        
Trade and other receivables 120,353 86,709    
Derivative financial instruments 0 0    
Restricted short-term investment 0      
Cash and cash equivalents 0 0    
Total $ 120,353 $ 86,709