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Retirement Benefit Plans (Schedule of Changes in Plan Assets, Changes in Projected Benefit Obligation, Rate Assumptions, and Components of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in fair value of plan assets    
Fair value of plan assets at beginning of year $ 20,327  
Fair value of plan assets at end of year 18,106 $ 20,327
Pension Plans, Defined Benefit    
Change in projected benefit obligation    
Benefit obligation at beginning of year 21,552 20,787
Service cost 4 4
Interest cost 757 831
Liability actuarial (gain) loss (1,270) 866
Benefits paid (993) (936)
Benefit obligation at end of year 20,050 21,552
Change in fair value of plan assets    
Fair value of plan assets at beginning of year 20,327 17,858
Return on plan assets (1,228) 2,505
Employer contributions 0 900
Benefits paid (993) (936)
Fair value of plan assets at end of year 18,106 20,327
Funded status (1,944) (1,225)
Supplemental Employee Retirement Plans, Defined Benefit    
Change in projected benefit obligation    
Benefit obligation at beginning of year 5,945 5,387
Service cost 249 198
Interest cost 248 204
Liability actuarial (gain) loss (328) 247
Benefits paid (98) (91)
Plan amendments 1,430 0
Benefit obligation at end of year $ 7,446 $ 5,945