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Retirement Benefit Plans (Obligation and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Amounts recognized in the balance sheets consist of:    
Non-current liabilities $ (4,787) $ (5,183)
Pension Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 28,357 31,722
Interest cost 1,360 1,639
Actuarial (gain) loss (427) 2,261
Benefits paid (2,610) (2,614)
Settlements 0 (4,651)
Projected benefit obligation at end of year 26,680 28,357
Accumulated benefit obligation at end of year 26,680 28,357
Change in plan assets    
Fair value of plan assets at beginning of year 30,128 34,485
Actual return on plan assets 258 2,452
Employer contributions 475 456
Benefits paid (2,610) (2,614)
Settlements 0 (4,651)
Fair value of plan assets at end of year 28,251 30,128
Funded status at end of year 1,571 1,771
Amounts recognized in the balance sheets consist of:    
Non-current assets 5,624 6,068
Current liabilities (515) (510)
Non-current liabilities (3,538) (3,787)
Amount recognized in the balance sheets 1,571 1,771
Components of accumulated other comprehensive loss consist of:    
Actuarial loss 12,072 11,379
Prior service cost 528 586
Deferred taxes (2,869) (2,724)
Accumulated other comprehensive (loss) income 9,731 9,241
Other Postretirement Benefits Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 1,579 1,551
Service cost 8 7
Interest cost 75 77
Actuarial (gain) loss (49) 173
Benefits paid (195) (229)
Projected benefit obligation at end of year 1,418 1,579
Change in plan assets    
Funded status at end of year (1,418) (1,579)
Amounts recognized in the balance sheets consist of:    
Current liabilities (169) (183)
Non-current liabilities (1,249) (1,396)
Amount recognized in the balance sheets (1,418) (1,579)
Components of accumulated other comprehensive loss consist of:    
Actuarial loss 416 542
Prior service cost 0 (6)
Deferred taxes (95) (123)
Accumulated other comprehensive (loss) income $ 321 $ 413