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Chartered-in Vessels - Commitment Under Capital Leases (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
vessel
Dec. 31, 2019
lease
Dec. 31, 2018
USD ($)
vessel
LNG Carriers        
Capital Leased Assets [Line Items]        
Number of vessels   9 9 8
Commitment        
2019       $ 119,517
2020 $ 140,386      
2020       118,685
2021 138,601      
2021       117,772
2022 136,959      
2022       116,978
2023 135,459      
2023       116,338
2024 132,011      
2024       113,704
Thereafter $ 1,198,366      
Thereafter       $ 1,006,966
Suezmax Tanker        
Capital Leased Assets [Line Items]        
Number of vessels | vessel       1