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Benefit Plans - Development of Funded Status (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension and Supplemental Executive Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation | $ 412,939 | $ 375,562 |
Projected Benefit Obligation | (413,350) | (376,153) | $ (417,770)
Plan Assets at Fair Value | 402,691 | 359,719 | 401,142
Funded Status - Overfunded/(Underfunded) | (10,659) | (16,434) |
Other Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation | 27,496 | 28,085 |
Projected Benefit Obligation | (27,496) | (28,085) | (24,716)
Plan Assets at Fair Value | 99,590 | 77,762 | $ 85,303
Funded Status - Overfunded/(Underfunded) | $ 72,094 | $ 49,677 |

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