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TRAFIGURA TRANSACTION (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 23, 2019 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) vessel suezmax_tanker $ / shares shares | Dec. 31, 2019 USD ($) vessel shares | Dec. 31, 2018 USD ($) large_range_2_tanker shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2019 suezmax_tanker | Dec. 31, 2019 USD ($) | Dec. 31, 2019 | Dec. 31, 2019 $ / shares | Dec. 31, 2019 large_range_2_tanker | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued for purchase of vessels (in shares) | shares |  | 16,035,856 | 16,035,856 | 0 | 0 |  |  |  |  |  |
Cash consideration due upon closing of SPA |  |  | $ 538,200,000 |  |  |  |  |  |  |  |
Number of assets chartered |  |  |  | 1 |  | 1 |  |  |  | 1 |
Number of leased assets | vessel |  | 5 |  |  |  |  |  |  |  |  |
Shares issued for purchase of assets, grant date fair value (in dollars per share) | $ / shares |  | $ 7.92 |  |  |  |  |  |  | $ 7.92 |  |
Finance lease, right of use asset |  |  |  | $ 90,676,000 | $ 251,698,000 |  | $ 418,390,000 |  |  |  | $ 536,433,000
Finance lease liability |  |  |  |  |  |  | 359,910,000 |  |  |  |
Finance lease, amortization of right of use asset |  |  | 15,850,000 | $ 26,129,000 | $ 64,200,000 |  |  |  |  |  |
Shares issued as consideration for Trafigura acquisition |  |  | $ 127,000,000 |  |  |  |  |  |  |  |
Vessels Chartered To Trafigura |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets chartered |  |  | 5 |  |  | 5 |  |  |  |  |
Duration of time charter |  |  | 3 years |  |  |  |  |  |  |  |
Time charter daily rate, revenue |  |  |  |  |  |  | 28,400 |  |  |  |
Profit share percentage |  |  |  |  |  |  |  | 50.00% |  |  |
Assets Under Sale and Purchase Agreement | Trafigura |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of assets agreed to acquire | suezmax_tanker |  | 10 |  |  |  |  |  |  |  |  |
Shares issued for purchase of vessels (in shares) | shares | 16,035,856 |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  | $ 8.00 |  |  |  |  |  |  |  |  |
Time charter daily rate, expense |  | $ 23,000 |  |  |  |  |  |  |  |  |
Duration of time charter |  | 3 years |  |  |  |  |  |  |  |  |
Time charter daily rate, revenue |  | $ 28,400 |  |  |  |  |  |  |  |  |
Profit share percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Number of assets optional to acquire | suezmax_tanker |  | 4 |  |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  | $ 538,200,000 |  |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  | $ 551,700,000 |  |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Vessels Chartered To Trafigura |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued for purchase of vessels (in shares) | shares |  |  | 8,017,928 |  |  |  |  |  |  |  |
Number of assets chartered | suezmax_tanker |  | 5 |  |  |  | 5 |  |  |  |  |
Shares issued for purchase of assets, grant date fair value (in dollars per share) | $ / shares | $ 7.92 |  |  |  |  |  |  |  |  |  |
Shares issued as consideration for Trafigura acquisition | $ 63,500,000 |  |  |  |  |  |  |  |  |  |
Time charter payments received |  |  | $ 9,900,000 |  |  |  |  |  |  |  |
Time charter payments received offset against prepaid expense |  |  | 8,200,000 |  |  |  |  |  |  |  |
Time charter payments received offset against lease liability |  |  | 1,700,000 |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Vessels Chartered To Trafigura | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  |  | 275,800,000 |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Vessels Chartered To Trafigura | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  |  | 269,000,000 |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Trafigura Vessels Not Chartered Out |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of leased assets | suezmax_tanker |  | 5 |  |  |  | 5 |  |  |  |  |
Prepaid expense | $ 63,500,000 |  |  |  |  |  |  |  |  |  |
Shares issued for purchase of assets, grant date fair value (in dollars per share) | $ / shares | $ 7.92 |  |  |  |  |  |  |  |  |  |
Finance lease, right of use asset |  |  |  |  |  |  | 336,000,000 |  |  |  |
Finance lease liability |  |  |  |  |  |  | $ 272,000,000 |  |  |  |
Finance lease, amortization of right of use asset |  |  | 3,800,000 |  |  |  |  |  |  |  |
Finance lease, interest expense |  |  | 3,800,000 |  |  |  |  |  |  |  |
Finance lease, weighted average discount rate |  |  |  |  |  |  |  | 4.36% |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Trafigura Vessels Not Chartered Out | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  |  | 275,900,000 |  |  |  |  |  |  |  |
Assets Under Sale and Purchase Agreement | Trafigura | Trafigura Vessels Not Chartered Out | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration due upon closing of SPA |  |  | $ 269,200,000 |  |  |  |  |  |  |  |

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