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Benefit Plans - Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 269,912 $ 331,943  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 204,531 264,974  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65,381 66,969  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 159,575 212,180  
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 159,575 212,180  
Equity securities | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14,093 14,186  
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14,093 14,186  
Cash and equivalents | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 96,244 105,577  
Fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30,863 38,608  
Fixed income | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65,381 66,969  
Fixed income | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 251,960 310,176 $ 278,124
Pension Benefits | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 90,914 $ 100,036  
Actual plan asset allocations as a percent of total plan assets 36.00% 32.00%  
Pension Benefits | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 147,864 $ 197,248  
Actual plan asset allocations as a percent of total plan assets 59.00% 64.00%  
Pension Benefits | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 13,182 $ 12,892  
Actual plan asset allocations as a percent of total plan assets 5.00% 4.00%  
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 17,952 $ 21,767 $ 19,479
Other Benefits | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,330 $ 5,541  
Actual plan asset allocations as a percent of total plan assets 30.00% 25.00%  
Other Benefits | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 11,711 $ 14,932  
Actual plan asset allocations as a percent of total plan assets 65.00% 69.00%  
Other Benefits | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 911 $ 1,294  
Actual plan asset allocations as a percent of total plan assets 5.00% 6.00%