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Employee and Retiree Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income Expected to be Amortized into Net Periodic Benefit Expense (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Net actuarial loss | $ (17,096)
Prior service cost | (734)
Amounts included in accumulated other comprehensive loss expected to be amortized into net periodic benefit expense | (17,830)
Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Net actuarial loss | 0
Prior service cost | 0
Amounts included in accumulated other comprehensive loss expected to be amortized into net periodic benefit expense | $ 0

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