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Financial instruments, Interest bearing debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Aug. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 30, 2017 | Nov. 30, 2014
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Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | $ 454,677 |  |  |  |  |  |  |
Carrying amount | 449,959 |  | $ 850,972 |  |  |  |  |
Credit Agricole Credit Facility [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | 37,839 |  |  |  |  |  |  |
Carrying amount | $ 37,626 |  | 55,719 |  |  |  |  |
Credit Agricole Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread | 2.19% |  |  |  |  |  |  |
Danish Ship Finance Credit Facility [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | $ 36,400 |  |  |  |  |  |  |
Carrying amount | $ 36,015 | $ 36,400 | 38,929 |  |  |  |  | $ 49,400
Danish Ship Finance Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread | 2.00% |  |  |  |  |  |  | 2.00%
Nordea Credit Facility [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | $ 110,933 |  |  |  |  |  |  |
Carrying amount | 109,423 |  | 207,175 |  | $ 96,000 | $ 204,000 | $ 300,000 |
Undrawn borrowing facilities | $ 70,300 |  |  |  |  |  |  |
Nordea Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread | 2.40% |  |  |  | 2.40% |  |  |
ABN Amro Credit Facility [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | $ 269,505 |  |  |  |  |  |  |
Carrying amount | 266,895 |  | 432,581 |  |  |  |  |
Undrawn borrowing facilities | $ 100,000 |  |  |  |  |  |  |
ABN Amro Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread | 2.40% |  |  |  |  |  |  |
ABN AMRO Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Remaining notional | $ 0 |  |  |  |  |  |  |
Carrying amount | $ 0 |  | 0 |  |  |  |  |
ABN AMRO Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread | 2.50% |  |  |  |  |  |  |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |  |
Interest rate spread |  |  |  | 4.50% |  |  |  |
Interest rate | 4.50% |  |  |  |  |  |  |
Remaining notional | $ 0 |  |  |  |  |  |  |
Carrying amount | $ 0 |  | $ 116,568 |  |  |  |  |

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