Restricted cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Restricted cash [Abstract]
Cash held by lessor VIEs	$ 54,147	$ 0
Collateral for interest rate swaps	12,500	0
Collateral for performance under customer agreements	15,000	15,000
Collateral for LNG purchases	0	11,664
Collateral for letters of credit and performance bonds	27,814	900
Other restricted cash	756	250
Total restricted cash	110,217	27,814
Current restricted cash	72,338	12,814
Non-current restricted cash	37,879	$ 15,000
Minimum [Member]
Restricted Cash [Abstract]
Cash balance required to maintain as financial covenants for sale and leaseback financings	$ 30,000