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Fair value of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Fair value of financial instruments [Line Items]      
Total financial assets at fair value through profit or loss $ 4,949 $ 6,492 $ 0
Total derivative financial instrument -assets 27,778 11,157  
Total securities and other financial assets 236,297 13,475  
Securities and other financial assets, net 398,068 88,794  
Total financial assets at fair value 264,075 24,632  
Total derivative financial instrument - liabilities 9,211 14,675  
Total financial liabilities at fair value 9,211 14,675  
Debt securities [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total financial assets at fair value through profit or loss 4,949 6,492  
Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total securities and other financial assets 0 0  
Total financial assets at fair value 0 0  
Total derivative financial instrument - liabilities 0 0  
Total financial liabilities at fair value 0 0  
Level 1 of fair value hierarchy [member] | Debt securities [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total financial assets at fair value through profit or loss 0 0  
Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 27,778 11,157  
Total securities and other financial assets 231,348 6,983  
Total financial assets at fair value 259,126 18,140  
Total derivative financial instrument - liabilities 9,211 14,675  
Total financial liabilities at fair value 9,211 14,675  
Level 2 of fair value hierarchy [member] | Debt securities [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total financial assets at fair value through profit or loss 0 0  
Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total securities and other financial assets 4,949 6,492  
Total financial assets at fair value 4,949 6,492  
Total derivative financial instrument - liabilities 0 0  
Total financial liabilities at fair value 0 0  
Level 3 | Debt securities [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total financial assets at fair value through profit or loss 4,949 6,492  
Interest rate swaps [Member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 1,831 407  
Total derivative financial instrument - liabilities 1,774 1,903  
Interest rate swaps [Member] | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Interest rate swaps [Member] | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 1,831 407  
Total derivative financial instrument - liabilities 1,774 1,903  
Interest rate swaps [Member] | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Cross-currency interest rate swaps [Member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 25,947 10,125  
Total derivative financial instrument - liabilities 3,848 10,197  
Cross-currency interest rate swaps [Member] | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Cross-currency interest rate swaps [Member] | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 25,947 10,125  
Total derivative financial instrument - liabilities 3,848 10,197  
Cross-currency interest rate swaps [Member] | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Foreign exchange forwards      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 625  
Total derivative financial instrument - liabilities 3,589 2,575  
Foreign exchange forwards | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Foreign exchange forwards | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 625  
Total derivative financial instrument - liabilities 3,589 2,575  
Foreign exchange forwards | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Total derivative financial instrument -assets 0 0  
Total derivative financial instrument - liabilities 0 0  
Securities at FVOCI - Corporate debt      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 226,235    
Securities at FVOCI - Corporate debt | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 0    
Securities at FVOCI - Corporate debt | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 226,235    
Securities at FVOCI - Corporate debt | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 0    
Securities at FVOCI - Sovereign debt      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 5,113 5,094  
Securities at FVOCI - Sovereign debt | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 0 0  
Securities at FVOCI - Sovereign debt | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss 5,113 5,094  
Securities at FVOCI - Sovereign debt | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss $ 0 0  
Equity instrument at FVOCI      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss   1,889  
Equity instrument at FVOCI | Level 1 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss   0  
Equity instrument at FVOCI | Level 2 of fair value hierarchy [member]      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss   1,889  
Equity instrument at FVOCI | Level 3      
Disclosure of Fair value of financial instruments [Line Items]      
Financial assets at fair value through profit or loss   $ 0