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Retirement Benefit Obligations - Components of net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]      
Post-employment benefit expense in profit or loss, defined benefit plans $ 127 $ 346 $ 213
Other comprehensive (income)/loss 82 (806) (538)
Total comprehensive (income)/loss 209 (460) (325)
Pension Benefits      
Disclosure of defined benefit plans [line items]      
Service cost 0 0 0
Administrative expenses 87 279 170
Net interest cost (16) 11 4
Post-employment benefit expense in profit or loss, defined benefit plans 71 290 174
Other comprehensive (income)/loss (37) (856) (232)
Total comprehensive (income)/loss 34 (566) (58)
Other post-retirement benefits      
Disclosure of defined benefit plans [line items]      
Service cost 3 3 4
Administrative expenses 0 0 0
Net interest cost 53 53 35
Post-employment benefit expense in profit or loss, defined benefit plans 56 56 39
Other comprehensive (income)/loss 119 50 (306)
Total comprehensive (income)/loss $ 175 $ 106 $ (267)