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Benefit Plan Schedule of balances of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax | $ 152 | $ 168
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax | 43,723 | 33,933
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (43,571) | (33,765)
Deferred Tax Assets, Tax Deferred Expense, Other | 9,150 | 7,091
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | $ (34,421) | $ (26,674)

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