Accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Cash and cash equivalents	$ 5,200		$ 5,200		$ 5,100
Deposits held in foreign bank	9,400		9,400
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ 16,602	$ 24,397	$ 40,799	$ 50,176
Bahamas [Member]
Deposits held in foreign bank					$ 3,000