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ASSET UNDER DEVELOPMENT - Narrative (Details) € in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Feb. 28, 2019 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 EUR (€) | Oct. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |  |
Asset under development |  |  | $ 434,248,000 | $ 20,000,000 |  |  |
Contractual obligation |  |  | 913,621,000 |  | € 1.1 |  |
Gimi 700 million Facility |  |  |  |  |  |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 700,000,000 |
Gimi Conversion |  |  |  |  |  |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |  |
Transfer to vessels and equipment, net |  |  | 0 | 1,296,431,000 |  |  |
Asset under development |  |  | $ 434,248,000 | $ 20,000,000 |  |  | $ 1,177,489,000
Contracted revenue, period |  | 20 years |  |  |  |  |
Contractual obligation | $ 1,300,000,000 |  |  |  |  |  |
Gimi Conversion | Keppel Capital |  |  |  |  |  |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |  |  |  |  |
Non-controlling contractual obligation, percentage | 30.00% |  |  |  |  |  |

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