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Borrowings - Existing facilities (Details) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) | Sep. 14, 2022 USD ($) | Oct. 26, 2021 USD ($) | Jul. 21, 2020 USD ($) | Jul. 16, 2020 USD ($) installment item | Feb. 20, 2019 USD ($) installment | Oct. 16, 2015 USD ($) installment tranche item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 01, 2019 USD ($) | Apr. 26, 2018 USD ($) | Jul. 03, 2017 USD ($) | May 03, 2017 USD ($)
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 |  |  |  |
Assumed October 2015 Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | 360,663 | 406,516 |  |  |  |  |
Number of international banks | item |  |  |  |  |  |  | 14 |  |  |  |  |  |  |
Number of semi annual installments for first three tranches | installment |  |  |  |  |  |  | 24 |  |  |  |  |  |  |
Number of years in profile for first three tranches |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |
Number of years in profile for fourth tranche |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |
Number of semi annual installments for the fourth tranche | installment |  |  |  |  |  |  | 20 |  |  |  |  |  |  |
Assumed October 2015 Facility | GAS-eleven Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,423
Number of tranches in loan agreement | item |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Loan agreement amount tranche one |  |  |  |  |  |  | $ 51,257 |  |  |  |  |  |  |
Loan agreement amount tranche two |  |  |  |  |  |  | 25,615 |  |  |  |  |  |  |
Loan agreement amount tranche three |  |  |  |  |  |  | 24,991 |  |  |  |  |  |  |
Loan agreement amount tranche four |  |  |  |  |  |  | $ 61,104 |  |  |  |  |  |  |
Assumed October 2015 Facility | GAS-twelve Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  |  |  |  |  |  |  | $ 134,107 |  |  |
Number of tranches in loan agreement | tranche |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Loan agreement amount tranche one |  |  |  |  |  |  | $ 51,257 |  |  |  |  |  |  |
Loan agreement amount tranche two |  |  |  |  |  |  | 25,615 |  |  |  |  |  |  |
Loan agreement amount tranche three |  |  |  |  |  |  | 24,991 |  |  |  |  |  |  |
Loan agreement amount tranche four |  |  |  |  |  |  | $ 61,104 |  |  |  |  |  |  |
Assumed October 2015 Facility | GAS-thirteen Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,005 |
Number of tranches in loan agreement | item |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Loan agreement amount tranche one |  |  |  |  |  |  | $ 50,544 |  |  |  |  |  |  |
Loan agreement amount tranche two |  |  |  |  |  |  | 25,258 |  |  |  |  |  |  |
Loan agreement amount tranche three |  |  |  |  |  |  | 24,643 |  |  |  |  |  |  |
Loan agreement amount tranche four |  |  |  |  |  |  | $ 60,252 |  |  |  |  |  |  |
Assumed October 2015 Facility | GAS-fourteen Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed from acquired entities |  |  |  |  |  |  |  |  |  |  |  | $ 143,622 |  |
Number of tranches in loan agreement | tranche |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Loan agreement amount tranche one |  |  |  |  |  |  | $ 50,544 |  |  |  |  |  |  |
Loan agreement amount tranche two |  |  |  |  |  |  | 25,258 |  |  |  |  |  |  |
Loan agreement amount tranche three |  |  |  |  |  |  | 24,643 |  |  |  |  |  |  |
Loan agreement amount tranche four |  |  |  |  |  |  | $ 60,252 |  |  |  |  |  |  |
KEXIM and K-Sure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of finance coverage |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |
2019 GasLog Partners Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | $ 450,000 |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | 250,320 | 273,568 |  |  |  |  |
Number of quarterly repayable installments | installment |  |  |  |  |  | 20 |  |  |  |  |  |  |  |
Installment amount |  |  |  |  |  | $ 7,357 |  |  |  |  |  |  |  |
Final balloon payment |  |  |  |  |  | $ 302,860 |  |  |  |  |  |  |  |
Maximum percentage of aggregate amount outstanding under facility to aggregate market value of vessels securing facility |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |
Amount available to be redrawn |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
2019 GasLog Partners Facility | GAS-three Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid amount of debt |  |  | $ 97,050 |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees written off to profit or loss |  |  | $ 604 |  |  |  |  |  |  |  |  |  |  |
GasLog Partners $260.3M Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  | $ 260,331 |  |  |  |  |  |  |  |  |
Drawn amount |  |  |  | $ 260,331 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | 193,790 | 243,137 |  |  |  |  |
Installment amount |  |  |  |  | 8,597 |  |  |  |  |  |  |  |  |
Final balloon payment |  |  |  |  | $ 174,361 |  |  |  |  |  |  |  |  |
Number of vessels refinanced | item |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Number of semi annual installments | installment |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
GasLog Partners $260.3M Facility | GAS-twenty, GAS-seven and GAS-eight Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refinance of outstanding debt |  |  |  | 258,532 |  |  |  |  |  |  |  |  |  |
GasLog Partners $260.3M Facility | GAS-twenty Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid amount of debt |  | $ 32,154 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees written off to profit or loss |  | $ 294 |  |  |  |  |  |  |  |  |  |  |  |
GasLog Partners $193.7M Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  | $ 193,713 |  |  |  |  |  |  |  |  |
Drawn amount |  |  |  | 193,713 |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  | $ 126,377 | $ 176,514 |  |  |  |  |
Installment amount |  |  |  |  | 8,599 |  |  |  |  |  |  |  |  |
Final balloon payment |  |  |  |  | $ 107,723 |  |  |  |  |  |  |  |  |
Number of vessels refinanced | installment |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Number of semi annual installments | item |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
GasLog Partners $193.7M Facility | GAS-nineteen Ltd., GAS-twenty one Ltd. and GAS-twenty-seven Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refinance of outstanding debt |  |  |  | $ 174,867 |  |  |  |  |  |  |  |  |  |
GasLog Partners $193.7M Facility | GAS-twenty one Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid amount of debt | $ 32,939 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees written off to profit or loss | $ 360 |  |  |  |  |  |  |  |  |  |  |  |  |

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