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Benefit Plans - Benefits Expected to be Paid in Next Five Years (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Pension Plan  
Expected Future Benefit Payments [Abstract]  
2022 $ 16,220
2023 16,385
2024 16,632
2025 16,896
2026 18,915
2027 - 2031 96,506
Other Postretirement Benefits Plan  
Expected Future Benefit Payments [Abstract]  
2022 1,497
2023 1,632
2024 1,697
2025 1,722
2026 1,763
2027 - 2031 9,117
Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Estimated required and discretionary employer cash contributions $ 8,820