Restricted cash (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Restricted cash [Abstract]
Cash held by lessor VIEs	$ 45,443	$ 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	13,231	900
Other restricted cash	1,006	250
Total restricted cash	87,180	27,814
Current restricted cash	57,353	12,814
Non-current restricted cash	29,827	$ 15,000
Minimum [Member]
Restricted Cash [Abstract]
Cash balance required to maintain as financial covenants for sale and leaseback financings	$ 30,000