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LEASES - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
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Jan. 31, 2019 suezmax_tanker | Sep. 30, 2018 large_range_2_tanker | Jul. 31, 2018 suezmax_tanker | Dec. 31, 2019 USD ($) suezmax_tanker | Dec. 31, 2018 USD ($) vessel large_range_2_tanker | Dec. 31, 2017 USD ($) | Dec. 31, 2019 vessel | Dec. 31, 2019 suezmax_tanker | Dec. 31, 2019 USD ($) | Dec. 31, 2019 | Dec. 31, 2019 large_range_2_tanker | Aug. 31, 2019 vessel
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of leased assets, finance leases | vessel |  |  |  |  |  |  |  |  |  |  |  | 5
Lease term |  |  |  | 2 years |  |  |  |  |  |  |  |
Lease expense |  |  |  | $ 11,200,000 | $ 23,200,000 | $ 21,200,000 |  |  |  |  |  |
Payments for operating leases |  |  |  | $ 10,800,000 |  |  |  |  |  |  |  |
Operating lease, weighted average discount rate |  |  |  |  |  |  |  |  |  | 3.90% |  |
Operating lease, weighted average remaining lease term |  |  |  | 4 years |  |  |  |  |  |  |  |
Number of assets chartered, fixed rate |  |  |  |  | 1 |  |  | 1 |  |  | 1 |
Number of assets chartered, index linked |  |  |  | 2 | 0 |  |  |  |  |  |  |
Ship operating expense |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-lease component |  |  |  | $ 6,600,000 |  |  |  |  |  |  |  |
Charter hire expense |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease expense |  |  |  | 8,500,000 |  |  |  |  |  |  |  |
Administrative expense |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease expense |  |  |  | $ 2,700,000 |  |  |  |  |  |  |  |
Ship Finance Leased Vessels |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of leased assets, finance leases | vessel |  |  |  |  | 3 |  | 3 |  |  |  |  |
Trafigura Vessels |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of leased assets, finance leases | vessel |  |  |  |  | 0 |  | 5 |  |  |  |  |
Other Leased Vessels |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of leased assets, operating leases | vessel |  |  |  |  | 2 |  | 2 |  |  |  |  |
Vessels Chartered To Trafigura |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of assets chartered, fixed rate |  |  |  |  |  |  | 5 | 5 |  |  |  |
Duration of time charter |  |  |  | 3 years |  |  |  |  |  |  |  |
Time charter daily rate, revenue |  |  |  |  |  |  |  |  | $ 28,400 |  |  |
Profit share percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |
Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vessels |  |  |  |  | $ 158,800,000 |  |  |  | 239,400,000 |  |  |
Accumulated depreciation |  |  |  |  | 12,300,000 |  |  |  | $ 47,800,000 |  |  |
July 2018 Lease Arrangement |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels leased out on fixed rate time charters with profit sharing agreements | suezmax_tanker |  |  | 1 |  |  |  |  |  |  |  |  |
Revenue on index linked time charters |  |  |  | $ 5,200,000 | 2,700,000 |  |  |  |  |  |  |
Profit share income |  |  |  | 1,600,000 |  |  |  |  |  |  |  |
September 2018 Lease Arrangement |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels leased out on fixed rate time charters with profit sharing agreements | large_range_2_tanker |  | 1 |  |  |  |  |  |  |  |  |  |
Revenue on index linked time charters |  |  |  | 5,000,000 | $ 2,400,000 |  |  |  |  |  |  |
January 2019 Lease Arrangement |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels leased out on fixed rate time charters with profit sharing agreements | suezmax_tanker | 1 |  |  |  |  |  |  |  |  |  |  |
Profit share income |  |  |  | $ 0 |  |  |  |  |  |  |  |

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