Accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash and cash equivalents	$ 7,400		$ 7,400		$ 7,400
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	6,988	$ 14,159	29,034	$ 14,051
Bahamas [Member]
Deposits held in foreign bank	11,500		11,500		3,900
Certificate of deposit
Cash and cash equivalents	$ 2,500		$ 2,500		$ 2,500