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v3.19.1

Long-Term Debt, Net - DVB Loan Agreement and Macquarie Loan Agreement (Details) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2011 USD ($) | Sep. 30, 2011 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proceeds from borrowings |  |  | $ 15,700 | $ 280 | $ 5,950
Repayments of debt |  |  | 19,497 | $ 4,399 | $ 3,100
DVB Bank SE |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Loan Facility, Maximum borrowing capacity | $ 40,000 |  |  |  |
DVB Bank SE | Tranche A |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proceeds from borrowings | $ 19,000 |  |  |  |
DVB Bank SE | Tranche B |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proceeds from borrowings |  | $ 18,000 |  |  |
DVB Bank SE | Tranche A and Tranche B |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Repayments of debt |  |  | 15,010 |  |
Macquarie Bank International Limited |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Loan Facility, Maximum borrowing capacity |  |  | 13,500 |  |
Macquarie Bank International Limited | Artful Advance |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proceeds from borrowings |  |  | $ 6,000 |  |
Borrowings Number Of Periodic Payments |  |  | 20 |  |
Borrowings Frequency Of Periodic Payment |  |  | quarterly |  |
Periodic payment |  |  | $ 222 |  |
Balloon Payment to be Paid |  |  | $ 1,560 |  |
Borrowings, maturity |  |  | December 2023 |  |
Macquarie Bank International Limited | Longevity Advance |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proceeds from borrowings |  |  | $ 7,500 |  |
Borrowings Number Of Periodic Payments |  |  | 20 |  |
Borrowings Frequency Of Periodic Payment |  |  | quarterly |  |
Periodic payment |  |  | $ 221 |  |
Balloon Payment to be Paid |  |  | $ 3,080 |  |
Borrowings, maturity |  |  | December 2023 |  |
Macquarie Bank International Limited | Minimum |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Fair value of mortgaged vessels to loan outstanding balance ratio |  |  | 160.00% |  |
Compensating Balance, Amount per vessel |  |  | $ 375 |  |

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