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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, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 27,544 $ 30,396
Sales (473) (487)
Gains (losses) included in earnings 3,903 (1,003)
Exchange rate effect (575) (1,362)
Ending Balance 30,399 27,544
Guaranteed Deposits [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 27,318 30,127
Sales (473) (487)
Gains (losses) included in earnings 3,885 (960)
Exchange rate effect (575) (1,362)
Ending Balance 30,155 27,318
Commingled Funds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 226 269
Sales
Gains (losses) included in earnings 18 (43)
Exchange rate effect
Ending Balance $ 244 $ 226