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Retirement Benefit Plans (Schedule of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 3 $ 4
Interest cost 819 757
Expected return on plan assets (1,273) (1,454)
Amortization of net loss 542 346
Net periodic benefit cost 91 (347)
Supplemental Employee Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 240 249
Interest cost 298 248
Amortization of prior service cost 318 501
Net periodic benefit cost $ 856 $ 998