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Employee Benefit Plans - Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 45,443
2021 44,157
2022 45,396
2023 46,400
2024 47,098
2025 — 2029 243,013
Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2020 2,988
2021 2,863
2022 2,902
2023 2,798
2024 2,730
2025 — 2029 $ 12,990