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Financial instruments, Interest bearing debt (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2014
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Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | $ 866,009 |  |  |  |  |  |
Carrying amount | 850,972 | $ 967,275 |  |  |  |  |
Credit Agricole Credit Facility [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | 56,120 |  |  |  |  |  |
Carrying amount | $ 55,719 | 62,166 |  |  |  |  |
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 | $ 39,000 |  |  |  |  |  |
Carrying amount | $ 38,929 | 41,437 |  |  |  |  | $ 49,400
Danish Ship Finance Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate spread | 2.25% |  |  |  |  |  | 2.25%
Nordea BW VLCC Acquisition Credit Facility [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Remaining notional | $ 209,628 |  |  |  |  |  |
Carrying amount | $ 207,175 | 254,870 | $ 96,000 | $ 204,000 | $ 300,000 |  |
Nordea BW VLCC Acquisition 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 | $ 436,261 |  |  |  |  |  |
Carrying amount | $ 432,581 | 464,826 |  |  |  |  |
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 |  |  |  |  |  |
ABN AMRO Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate spread | 2.50% |  |  |  |  | 2.50% |
Convertible Senior Notes due 2019 [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate | 4.50% |  |  |  |  |  |
Remaining notional | $ 0 |  |  |  |  |  |
Carrying amount | $ 0 | 32,009 |  |  |  |  |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |  |  |
Interest-bearing debt [Abstract] |  |  |  |  |  |  |
Interest rate | 4.50% |  |  |  |  |  |
Remaining notional | $ 125,000 |  |  |  |  |  |
Carrying amount | $ 116,568 | $ 111,968 |  |  |  |  |

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