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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%