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Cash Flow Reconciliations - Reconciliation of borrowings, derivatives and leases (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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