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Employee and Retiree Benefit Plans - Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Funded plan | Qualified plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | $ 762,134 | $ 688,249
Accumulated Benefit Obligations | 753,475 | 676,177
Fair Value of Plan Assets | 564,238 | 525,108
Unfunded plan | Other postretirement plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 108,378 | 108,401
Accumulated Benefit Obligations | 108,378 | 108,401
Fair Value of Plan Assets | 0 | 0
Unfunded plan | Nonqualified plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligations | 201,372 | 177,999
Accumulated Benefit Obligations | 198,792 | 171,934
Fair Value of Plan Assets | $ 0 | $ 0

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