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Retirement Benefit Plans (Obligation and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the balance sheets consist of:    
Non-current liabilities $ (8,807) $ (10,429)
Pension Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 42,026 46,065
Interest cost 1,710 1,581
Actuarial loss (gain) 3,121 (3,286)
Benefits paid (2,391) (2,334)
Settlements 2,612 0
Projected benefit obligation at end of year 41,854 42,026
Accumulated benefit obligation at end of year 41,854 42,026
Change in plan assets    
Fair value of plan assets at beginning of year 34,954 38,527
Actual return (loss) on plan assets 6,930 (1,832)
Employer contributions 483 593
Benefits paid (2,391) (2,334)
Settlements (2,612) 0
Fair value of plan assets at end of year 37,364 34,954
Funded status at end of year (4,490) (7,072)
Amounts recognized in the balance sheets consist of:    
Non-current assets 3,079 2,047
Current liabilities (606) (588)
Non-current liabilities (6,963) (8,531)
Amount recognized in the balance sheets (4,490) (7,072)
Components of accumulated other comprehensive loss (income) consist of:    
Actuarial loss 13,951 16,277
Prior service cost 819 878
Deferred taxes (3,305) (3,320)
Accumulated other comprehensive (loss) income 11,465 13,835
Other Postretirement Benefits Plan    
Change in benefit obligation    
Projected benefit obligation at beginning of year 2,113 3,221
Service cost 24 50
Interest cost 77 98
Plan amendments 0 326
Actuarial loss (gain) 46 (756)
Benefits paid (211) (174)
Projected benefit obligation at end of year 2,049 2,113
Change in plan assets    
Funded status at end of year (2,049) (2,113)
Amounts recognized in the balance sheets consist of:    
Current liabilities (204) (215)
Non-current liabilities (1,845) (1,898)
Amount recognized in the balance sheets (2,049) (2,113)
Components of accumulated other comprehensive loss (income) consist of:    
Actuarial loss 227 189
Prior service cost (259) (339)
Deferred taxes (96) (74)
Accumulated other comprehensive (loss) income $ (128) $ (224)