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SEGMENT INFORMATION - Geographic Data (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues $ 438,637 $ 448,750 $ 430,604
Total assets 4,314,229 4,632,144  
Vessels - FLNG | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 226,061 218,096 127,625
Total assets 1,933,677 1,814,588  
Vessels - FLNG | CAMEROON | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 1,264,085 1,333,779 1,535,389
Liquefaction services revenue      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 226,061 218,096 127,625
Liquefaction services revenue | Vessels - FLNG | CAMEROON | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues $ 226,061 $ 218,096 $ 127,625