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Borrowings - Terminated Facilities (Details) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2020 USD ($) | Mar. 18, 2020 USD ($) | Jan. 05, 2018 USD ($) | Apr. 05, 2017 USD ($) | Jul. 25, 2016 USD ($) | Jul. 19, 2016 USD ($) item | Apr. 05, 2016 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 14, 2018 USD ($) | Feb. 18, 2016 USD ($)
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Drawn amount |  |  |  |  |  |  |  |  |  | $ 479,984 |  |  |
Amount outstanding |  |  |  |  |  |  |  | $ 921,946 | $ 1,085,758 |  |  |  |
Unamortized loan fees written off to profit or loss |  |  |  |  |  |  |  | $ 654 | $ 604 | $ 1,918 |  |  |
Five Vessel Refinancing |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees written off to profit or loss | $ 977 |  |  |  |  |  |  |  |  |  |  |  |
Five Vessel Refinancing | GAS-twenty seven Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  |  |  |  |  |  |  |  | $ 93,896 |
Five Vessel Refinancing | GAS-nineteen Ltd., GAS-twenty Ltd., GAS-twenty one Ltd and GAS-twenty seven Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Refinance of outstanding debt |  |  |  |  |  |  | $ 535,500 |  |  |  |  |  |
Five-year senior tranche facility |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Drawn amount |  |  |  |  |  |  | 323,162 |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 240,422 |  |
Prepayment of debt | 221,553 |  |  |  |  |  |  |  |  |  |  |  |
Five-year senior tranche facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan facility amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 396,500
Two-year bullet junior tranche facility |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Drawn amount |  |  |  |  |  |  | $ 149,792 |  |  |  |  |  |
Prepayment of debt |  |  | $ 29,750 | $ 120,042 |  |  |  |  |  |  |  |  |
Two-year bullet junior tranche facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan facility amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,000
Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, Skandinaviska Enskilda Banken AB (publ), HSBC Bank Plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V (Legacy Facility Refinancing) |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan facility amount |  |  |  |  |  | $ 1,050,000 |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 201,037 |  |
Prepayment of debt | 211,846 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees written off to profit or loss | $ 941 |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels refinanced | item |  |  |  |  |  | 8 |  |  |  |  |  |  |
Number of existing credit facilities being refinanced | item |  |  |  |  |  | 6 |  |  |  |  |  |  |
Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, Skandinaviska Enskilda Banken AB (publ), HSBC Bank Plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V (Legacy Facility Refinancing) | GAS-seven Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  | $ 122,292 |  |  |  |  |  |  |  |
Refinance of outstanding debt |  |  |  |  | 124,000 |  |  |  |  |  |  |  |
Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, Skandinaviska Enskilda Banken AB (publ), HSBC Bank Plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V (Legacy Facility Refinancing) | GAS-eight Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  | 124,141 |  |  |  |  |  |  |  |
Refinance of outstanding debt |  |  |  |  | $ 127,080 |  |  |  |  |  |  |  |
Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, Skandinaviska Enskilda Banken AB (publ), HSBC Bank Plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V (Term loan facility) |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan facility amount |  |  |  |  |  | $ 950,000 |  |  |  |  |  |  |
Term of debt instrument |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, Skandinaviska Enskilda Banken AB (publ), HSBC Bank Plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V (Revolving credit facility) |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loan facility amount |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Drawn amount |  | $ 25,940 |  |  |  |  |  |  |  |  |  |  |

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