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Retirement Benefit Plans (Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1,710 $ 1,581
Expected return on plan assets (2,778) (2,852)
Amortization of actuarial loss 422 484
Amortization of prior service cost 58 58
Settlements 873 0
Net periodic pension expense (income) 285 (729)
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 24 50
Interest cost 77 98
Amortization of actuarial loss 8 96
Amortization of prior service cost (80) (64)
Net periodic pension expense (income) $ 29 $ 180