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Intangible assets, net, Composition of intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Intangible Assets, Net [Abstract]    
Definite-Lived Intangible Assets, Accumulated Amortization $ 2,628 $ 1,337
Definite-Lived Intangible Assets, Net Carrying Amount 44,828  
Total Intangible Assets, Gross Carrying Amount 48,730 44,877
Total Intangible Assets, Net Carrying Amount $ 46,102 $ 43,540
Weighted average remaining amortization period for intangible assets 37 years 6 months 38 years 9 months 18 days
Easements [Member]    
Intangible Assets, Net [Abstract]    
Indefinite-Lived Intangible Assets, Carrying Amount $ 1,274 $ 1,161
Shannon LNG Permits [Member]    
Intangible Assets, Net [Abstract]    
Definite-Lived Intangible Assets, Gross Carrying Amount 45,897 42,157
Definite-Lived Intangible Assets, Accumulated Amortization 2,438 1,198
Definite-Lived Intangible Assets, Net Carrying Amount $ 43,459 $ 40,959
Definite-Lived Intangible Assets, Weighted Average Life 40 years 40 years
Easements [Member]    
Intangible Assets, Net [Abstract]    
Definite-Lived Intangible Assets, Gross Carrying Amount $ 1,559 $ 1,559
Definite-Lived Intangible Assets, Accumulated Amortization 190 139
Definite-Lived Intangible Assets, Net Carrying Amount $ 1,369 $ 1,420
Definite-Lived Intangible Assets, Weighted Average Life 30 years 30 years