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Retirement Benefit Obligations - Movement in Defined Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Disclosure of defined benefit plans [line items]      
Interest cost $ 71 $ 290 $ 174
Other $ 0 $ 0 0
Discount rate used in computing ending obligations 5.35% 4.84%  
Pension Benefits | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Beginning balance $ 10,294 $ 10,594  
Service cost 0 0  
Interest cost 461 502  
Benefits paid (952) (860)  
Actuarial (gain)/loss (442) 58  
Other 0 0  
Ending balance 9,361 10,294 10,594
Other post-retirement benefits      
Disclosure of defined benefit plans [line items]      
Interest cost 56 56 39
Other $ 46 $ 0 0
Discount rate used in computing ending obligations 5.35% 4.84%  
Other post-retirement benefits | Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Beginning balance $ 1,131 $ 1,097  
Service cost 3 3  
Interest cost 53 53  
Benefits paid (99) (72)  
Actuarial (gain)/loss 119 50  
Other 46 0  
Ending balance $ 1,253 $ 1,131 $ 1,097