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Postretirement Benefit Plans - Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Defined Benefit Postretirement Health And Life Coverage  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 25
2025 30
2026 28
2027 28
2028 19
2029-2033 93
Scottdale Defined Benefit Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 91
2025 142
2026 140
2027 171
2028 200
2029-2033 1,052
Riverview Defined Benefit Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 552
2025 531
2026 518
2027 501
2028 494
2029-2033 2,271
Riverview Defined Benefit Plan | Postretirement Life Insurance Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 3
2025 4
2026 3
2027 3
2028 2
2029-2033 $ 9