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Pension and Other Postretirement Benefit Plans (Schedule of Amounts Included in Accumulated Other Comprehensive Loss to be Recognized over Next Fiscal Year) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Prior service credit recognition $ 0
Actuarial loss recognition 6,922
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Prior service credit recognition (2,405)
Actuarial loss recognition $ 9,278