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Retirement Benefit Plans (Obligation and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Amounts recognized in the balance sheets consist of:    
Non-current liabilities $ (5,082) $ (6,605)
Pension Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 41,663 44,600
Interest cost 1,105 1,002
Actuarial gain (8,396) (1,367)
Benefits paid (2,650) (2,572)
Projected benefit obligation at end of year 31,722 41,663
Accumulated benefit obligation at end of year 31,722 41,663
Change in plan assets    
Fair value of plan assets at beginning of year 44,009 41,099
Actual return on plan assets (7,405) 4,995
Employer contributions 531 487
Benefits paid (2,650) (2,572)
Fair value of plan assets at end of year 34,485 44,009
Funded status at end of year 2,763 2,346
Amounts recognized in the balance sheets consist of:    
Non-current assets 6,991 7,806
Current liabilities (491) (542)
Non-current liabilities (3,737) (4,918)
Amount recognized in the balance sheets 2,763 2,346
Components of accumulated other comprehensive loss consist of:    
Actuarial loss 10,682 9,510
Prior service cost 645 703
Deferred taxes (2,490) (2,254)
Accumulated other comprehensive (loss) income 8,837 7,959
Other Postretirement Benefits Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 1,877 2,054
Service cost 12 13
Interest cost 38 27
Actuarial gain (44) (48)
Benefits paid (332) (169)
Projected benefit obligation at end of year 1,551 1,877
Change in plan assets    
Funded status at end of year (1,551) (1,877)
Amounts recognized in the balance sheets consist of:    
Current liabilities (206) (190)
Non-current liabilities (1,345) (1,687)
Amount recognized in the balance sheets (1,551) (1,877)
Components of accumulated other comprehensive loss consist of:    
Actuarial loss 412 520
Prior service cost (56) (108)
Deferred taxes (180) (195)
Accumulated other comprehensive (loss) income $ 176 $ 217