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Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) - Pension plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning of year $ 211,755 $ 178,942
Fair value of plan assets, end of year 239,051 211,755
Insurance contracts | Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning of year 3,244 2,890
Net realized gains 0 0
Net unrealized gains 22 20
Net purchases,issuances and settlements 553 334
Net transfers (out of) Level 3 0 0
Fair value of plan assets, end of year $ 3,819 $ 3,244