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Restricted cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Restricted cash [Abstract]    
Collateral for performance under customer agreements $ 15,000 $ 15,000
Collateral for LNG purchases 19,070 35,000
Collateral for letters of credit and performance bonds 6,394 7,388
Debt service reserve account 0 8,299
Other restricted cash 250 250
Total restricted cash 40,714 65,937
Current restricted cash 25,714 30,966
Non-current restricted cash $ 15,000 $ 34,971