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Benefit Plans - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension and Supplemental Executive Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Actuarial (Gain)/Loss | $ 98,899 | $ 99,826 |
Net Prior Service Cost/(Credit) | (988) | (1,237) |
Net Transition Obligation/(Asset) | 0 | 0 |
Total at Year End | 97,911 | 98,589 | $ 108,808
Other Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Actuarial (Gain)/Loss | (30,565) | (18,005) |
Net Prior Service Cost/(Credit) | 2,673 | 2,724 |
Net Transition Obligation/(Asset) | 0 | 0 |
Total at Year End | $ (27,892) | $ (15,281) | $ 3,629

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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