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Financial instruments by category - Carrying amounts of financial assets and financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets as per statement of financial position        
Trade and other receivables $ 188,080 $ 197,928    
Derivative financial instruments 1,585 2,102    
Cash and cash equivalents 199,766 336,282 $ 290,276 $ 273,635
Total 389,431 536,312    
Liabilities as per statement of financial position        
Trade and other payables 169,030 126,605    
Total debt 817,651 971,090 $ 968,280  
Lease liabilities 246,854 195,772    
Derivative financial instruments 1,283 13,141    
Total 1,234,818 1,306,608    
Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 153,459 114,813    
Total debt 817,651 971,090    
Lease liabilities 246,854 195,772    
Derivative financial instruments 1,283 13,141    
Total 1,219,247 1,294,816    
Non- financial liabilities        
Liabilities as per statement of financial position        
Trade and other payables 15,571 11,792    
Total debt 0 0    
Lease liabilities 0 0    
Derivative financial instruments 0 0    
Total 15,571 11,792    
Liabilities at fair value through profit or loss | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 0 0    
Total debt 0 0    
Lease liabilities 0 0    
Derivative financial instruments 1,283 13,141    
Total 1,283 13,141    
Financial liabilities at amortized cost | Financial Liability Instrument        
Liabilities as per statement of financial position        
Trade and other payables 153,459 114,813    
Total debt 817,651 971,090    
Lease liabilities 246,854 195,772    
Derivative financial instruments 0 0    
Total 1,217,964 1,281,675    
Financial Assets Instruments        
Assets as per statement of financial position        
Trade and other receivables 101,371 109,231    
Derivative financial instruments 1,585 2,102    
Cash and cash equivalents 199,766 336,282    
Total 302,722 447,615    
Financial Assets Instruments | Financial asset / liabilities at amortized cost        
Assets as per statement of financial position        
Trade and other receivables 101,371 109,231    
Derivative financial instruments 0 0    
Cash and cash equivalents 199,766 336,282    
Total 301,137 445,513    
Financial Assets Instruments | Assets at fair value through profit or loss        
Assets as per statement of financial position        
Trade and other receivables 0 0    
Derivative financial instruments 1,585 2,102    
Cash and cash equivalents 0 0    
Total 1,585 2,102    
Non- financial assets        
Assets as per statement of financial position        
Trade and other receivables 86,709 88,697    
Derivative financial instruments 0 0    
Cash and cash equivalents 0 0    
Total $ 86,709 $ 88,697