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Retirement Benefits (Schedule of Rollforward of Level 3 Assets) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 30,399 $ 27,544
Sales (616) (473)
Gains (losses) included in earnings 4,132 3,903
Exchange rate effect (575)
Ending Balance 33,915 30,399
Guaranteed Deposits [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 30,155 27,318
Sales (616) (473)
Gains (losses) included in earnings 4,194 3,885
Exchange rate effect (575)
Ending Balance 33,733 30,155
Commingled Funds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 244 226
Sales
Gains (losses) included in earnings (62) 18
Exchange rate effect
Ending Balance $ 182 $ 244