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Cash Flow Reconciliations - Reconciliation of borrowings, derivatives and leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Borrowings      
Disclosure of reconciliation of liabilities arising from financing activities      
Liabilities/(assets) arising from financing activities at beginning of year $ 1,085,758 $ 1,285,543 $ 1,346,024
Liabilities/(assets) arising from financing activities at end of year 921,946 1,085,758 1,285,543
Borrowings | Drawdowns      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows     479,984
Total     479,984
Borrowings | Repayments      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows (168,585) (205,179) (540,701)
Total (168,585) (205,179) (540,701)
Borrowings | Additions in deferred loan issuance costs      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows (21)   (7,362)
Non-cash items (14)   164
Deferred financing costs, assets 14    
Total (21)   (7,198)
Borrowings | Amortization and write-off of deferred loan issuance costs      
Disclosure of reconciliation of liabilities arising from financing activities      
Non-cash items 4,794 5,394 7,434
Total 4,794 5,394 7,434
Derivatives      
Disclosure of reconciliation of liabilities arising from financing activities      
Liabilities/(assets) arising from financing activities at beginning of year 9,245 20,337 8,923
Liabilities/(assets) arising from financing activities at end of year (3,576) 9,245 20,337
Derivatives | Proceeds from entering into interest rate swaps      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows     16,056
Total     16,056
Derivatives | Payment for interest rate swaps termination      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows     (13,210)
Total     (13,210)
Derivatives | Unrealized loss/(gain) on interest rate swaps held for trading      
Disclosure of reconciliation of liabilities arising from financing activities      
Non-cash items (12,821) (11,092) 8,623
Total (12,821) (11,092) 8,623
Derivatives | Unrealized gain on forward foreign exchange contracts held for trading      
Disclosure of reconciliation of liabilities arising from financing activities      
Non-cash items     (55)
Total     (55)
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities      
Liabilities/(assets) arising from financing activities at beginning of year 55,898 444 886
Liabilities/(assets) arising from financing activities at end of year 62,569 55,898 444
Lease liabilities | Additions      
Disclosure of reconciliation of liabilities arising from financing activities      
Non-cash items 18,913 57,671 34
Total 18,913 57,671 34
Lease liabilities | Lease expense      
Disclosure of reconciliation of liabilities arising from financing activities      
Non-cash items 1,668 333 33
Total 1,668 333 33
Lease liabilities | Payments for interest      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows (1,668) (333) (34)
Total (1,668) (333) (34)
Lease liabilities | Payments for lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities      
Cash flows (12,242) (2,217) (540)
Non-cash items     65
Total $ (12,242) $ (2,217) $ (475)