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Financial instruments, Interest bearing debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Aug. 31, 2018 | Nov. 30, 2014
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Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | $ 530,477 |  |  |  |  |  |
Carrying amount | 522,299 |  |  | $ 449,959 |  |  |
Credit Agricole Credit Facility [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | 35,136 |  |  |  |  |  |
Carrying amount | $ 35,002 |  |  | 37,626 |  |  |
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 | $ 33,973 |  |  |  |  |  |
Carrying amount | $ 33,683 |  |  | 36,015 | $ 36,400 |  | $ 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 | $ 231,300 |  |  |  |  |  |
Carrying amount | 225,214 |  | $ 316,200 | 109,423 |  |  |
Undrawn borrowing facilities | $ 78,700 |  |  |  |  |  |
Nordea Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate spread | 1.90% | 1.90% |  |  |  |  |
ABN Amro Credit Facility [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | $ 230,067 |  |  |  |  |  |
Carrying amount | 228,400 |  |  | $ 266,895 |  |  |
Undrawn borrowing facilities | $ 100,000 |  |  |  |  |  |
ABN Amro Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate spread | 2.40% |  |  |  |  |  |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate spread |  |  |  |  |  | 4.50% |

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