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Long-term debt - Information Per Loan 1 (Details) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 7 Months Ended | 9 Months Ended | 10 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Jan. 30, 2019 USD ($) | Mar. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | May 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Oct. 31, 2018 USD ($) | Nov. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
SEB Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  |  |  |  |  |  |  | Jan. 28, 2019
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 71,420
Number of loan tranches |  |  |  |  |  |  |  |  |  |  | 4
Vessels provided as collateral |  |  |  |  |  |  |  |  |  |  | The SEB Facility is secured by a first priority mortgage on the vessels Star Laetitia and Star Sienna.
SEB Facility | Tranche A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  | $ 32,825 |  |  |  |  |  |  |  |  |
Repayment period |  |  |  |  |  |  |  |  |  |  | 6 years
Number of installments |  |  |  |  |  |  |  |  |  |  | 24
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 18,723
Expiration date |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2025
SEB Facility | Tranche B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  | $ 32,825 |  |  |  |  |  |  |  |  |
Repayment period |  |  |  |  |  |  |  |  |  |  | 6 years
Number of installments |  |  |  |  |  |  |  |  |  |  | 24
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 18,723
Expiration date |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2025
SEB Facility | First Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The first two tranches were used together with cash on hand to refinance the outstanding amounts under the lease agreements of the Star Laetitia and the Star Sienna.
SEB Facility | First Two Tranches | First 10 Quarters |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 677
SEB Facility | First Two Tranches | Remaining 14 Quarters |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayment installment |  |  |  |  |  |  |  |  |  |  | 524
SEB Facility | Tranche C |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  | $ 1,260 |  |  |
SEB Facility | Tranche D |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 1,260
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 1,260
SEB Facility | Remaining Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 12
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The remaining two tranches were used to finance the acquisition and installation of scrubber equipment for the vessels Star Laetitia and Star Sienna.
E SUN Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2019
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 37,100
Amount drawn down |  |  | $ 37,100 |  |  |  |  |  |  |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 20
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 618
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 24,733
Expiration date |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2024
Vessels provided as collateral |  |  |  |  |  |  |  |  |  |  | The E SUN Facility is secured by a first priority mortgage on the Star Ariadne.
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The E SUN Facility was used to refinance the outstanding amount under the lease agreement of the Star Ariadne.
Atradius Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  |  |  |  |  |  |  | Feb. 28, 2019
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 36,645
Number of vessels financed for scrubber equipment and installation |  |  |  |  |  |  |  |  |  |  | 42
Number of installments |  |  |  |  |  |  |  |  |  |  | 10
Frequency of payments |  |  |  |  |  |  |  |  |  |  | semi-annual
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 3,664
Vessels provided as collateral |  |  |  |  |  |  |  |  |  |  | The Atradius Facility is secured by second-priority mortgage on 22 vessels of our fleet.
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The Atradius Facility is to be used to finance the acquisition and installation of scrubber equipment for 42 vessels.
Atradius Facility | Three Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  |  | $ 33,311
Atradius Facility | Last Tranche | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down | $ 3,331 |  |  |  |  |  |  |  |  |  |
ING $100,600 Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  |  |  |  |  |  |  | Mar. 28, 2019
Line of Credit Facility, Increase |  |  |  |  |  |  |  |  |  |  | $ 52,800
Number of loan tranches |  |  |  |  |  |  |  |  |  |  | 4
Vessels provided as collateral |  |  |  |  |  |  |  |  |  |  | The ING $100,600 Facility is secured by a first priority mortgage on the vessels Peloreus, Leviathan, Star Magnanimus and Star Allessia.
ING $100,600 Facility | Tranche A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 32,100 |  |  |  |  |  |  |
Repayment period |  |  |  |  |  |  |  |  |  |  | 7 years
Number of installments |  |  |  |  |  |  |  |  |  |  | 28
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 535
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 17,120
ING $100,600 Facility | Tranche B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  | $ 17,400 |  |  |  |  |  |
Repayment period |  |  |  |  |  |  |  |  |  |  | 7 years
Number of installments |  |  |  |  |  |  |  |  |  |  | 28
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 311
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 8,700
ING $100,600 Facility | First Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The first two tranches were used to refinance the outstanding amounts under the lease agreements of the Star Magnanimus and the Star Alessia.
ING $100,600 Facility | Tranche C |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  | $ 1,400 |  |  |  |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 16
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 88
ING $100,600 Facility | Tranche D |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  | $ 1,400 |
Number of installments |  |  |  |  |  |  |  |  |  |  | 16
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 88
ING $100,600 Facility | Remaining Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The remaining two tranches were used to finance the acquisition and installation of scrubber equipment for the vessels Star Magnanimus and the Star Alessia.
ING $47,800 Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 47,800
ING $47,800 Facility | Tranche A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | $ 22,500 |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 28
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 469
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 9,375
ING $47,800 Facility | Tranche B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | $ 22,500 |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 28
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 469
Balloon installment |  |  |  |  |  |  |  |  |  |  | $ 9,375
ING $47,800 Facility | First Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The first two tranches of ING $47,800 Facility were used to refinance the outstanding amount of Deutsche Bank $85,000 Facility.
ING $47,800 Facility | Tranche C |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  | $ 1,400 |  |  |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 16
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 88
ING $47,800 Facility | Tranche D |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  | $ 1,400 |  |  |  |
Number of installments |  |  |  |  |  |  |  |  |  |  | 16
Frequency of payments |  |  |  |  |  |  |  |  |  |  | quarterly
Repayment installment |  |  |  |  |  |  |  |  |  |  | $ 88
ING $47,800 Facility | Remaining Two Tranches |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, description |  |  |  |  |  |  |  |  |  |  | The remaining two tranches of ING $47,800 Facility were used to finance the acquisition and installation of scrubber equipment for the vessels Peloreus and Leviathan.

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