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COMMITMENTS AND CONTINGENT LIABILITIES (Details) | Jun. 30, 2019 USD ($) tanker carrier | Dec. 31, 2018 USD ($)
--- | --- | ---
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | $ 1,650,000,000 | $ 1,527,000,000
Number of vessels under capital lease obligations held as investments in direct financing lease assets | 4 |
Number of vessels under capital lease obligations held as vessels under capital lease | 7 |
Number of vessels under capital lease obligation | 11 | 11
Long-term debt | $ 1,484,631,000 |
Loans to related parties - associated companies, long-term | 312,660,000 | $ 310,144,000
Seadrill [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans to related parties - associated companies, long-term | 319,000,000.0 | 342,000,000.0
Equity Accounted Subsidiaries [Member] |  |
Commitments and Contingencies [Line Items] |  |
Long-term debt | 645,918,000 | 655,186,000
Amount guaranteed by Ship Finance | 266,100,000 | 266,100,000
Equity Accounted Subsidiaries [Member] | Financial Guarantee [Member] |  |
Commitments and Contingencies [Line Items] |  |
Amount guaranteed by Ship Finance | 266,114,000 | 266,114,000
Ship Finance Ltd and Equity Accounting Subsidiaries [Member] |  |
Commitments and Contingencies [Line Items] |  |
Long-term debt | 2,100,000,000 | 2,100,000,000
Property not subject to direct financing leases [Member] |  |
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | 1,415,900,000 | 1,424,400,000
Property subject to direct financing leases [Member] |  |
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | 234,400,000 | 103,100,000
Assets Held under Capital Leases [Member] |  |
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | 1,305,500,000 | 1,331,100,000
Property subject to capital lease, held as vessels under capital lease asset [Domain] |  |
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | 732,500,000 | 749,900,000
Property subject to capital lease, held as investments in direct financing lease assets [Domain] |  |
Commitments and Contingencies [Line Items] |  |
Book value of assets pledged under ship mortgages | $ 572,900,000 | 581,200,000
Commitments for Exhaust Gas Cleaning Systems [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of container vessels | 7 |
Number of Oil Tankers | 4 |
Commitments for Exhaust Gas Cleaning Systems [Member] | Crude Oil Tankers [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of container vessels with amended charter terms | $ 8,500,000 | 3,400,000
Commitments for Exhaust Gas Cleaning Systems [Member] | Container vessels [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of container vessels with amended charter terms | 43,100,000 | $ 0
Commitments for Exhaust Gas Cleaning Systems [Member] | Containers for which lease amendments were made [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of container vessels with amended charter terms | $ 4 |
Commitments for Ballast Water Treatment System [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of Oil Tankers | tanker | 1 |
Number of drybulk carriers | carrier | 1 |
Commitments for Ballast Water Treatment System [Member] | Crude Oil Tankers [Member] |  |
Commitments and Contingencies [Line Items] |  |
Number of container vessels with amended charter terms | $ 900,000 |

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