Taxation - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 4,041	$ 3,753
State	3	0
Foreign	0	(40)
Current income tax expense (benefit)	4,044	3,713
Deferred:
Federal	2,999	3,038
State	(26)	0
Foreign	0	0
Deferred income tax expense (benefit)	2,973	3,038
Total	$ 7,017	$ 6,751