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Benefit Plans - Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 331,172	$ 306,711
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	255,366	238,665
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,806	68,046
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	195,840	188,579
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	195,840	188,579
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	12,977	11,038
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,977	11,038
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	122,355	107,094
Fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46,549	39,048
Fixed income | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,806	68,046
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	307,947	285,504	$ 251,960
Pension Benefits | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 116,987	$ 101,498
Actual plan asset allocations as a percent of total plan assets	38.00%	36.00%
Pension Benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 179,103	$ 174,155
Actual plan asset allocations as a percent of total plan assets	58.00%	61.00%
Pension Benefits | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11,857	$ 9,851
Actual plan asset allocations as a percent of total plan assets	4.00%	3.00%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 23,225	$ 21,207	$ 17,952
Other Postretirement Benefits | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,368	$ 5,596
Actual plan asset allocations as a percent of total plan assets	23.00%	26.00%
Other Postretirement Benefits | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16,737	$ 14,424
Actual plan asset allocations as a percent of total plan assets	72.00%	68.00%
Other Postretirement Benefits | Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,120	$ 1,187
Actual plan asset allocations as a percent of total plan assets	5.00%	6.00%

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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