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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

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