Benefit Plans - Changes to Benefit Obligations and Fair Value of Plan Assets and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes to PBO or APBO
Interest cost	$ 3,309	$ 3,643	$ 2,466
Funded status and amounts recognized in balance sheets
Pension liabilities for underfunded plans	(97,135)	(103,285)
Defined Benefit Plan, Funded Plan [Member]
Changes to PBO or APBO
Benefit obligation at beginning of year	67,070
Benefit obligation at end of year	61,783	67,070
Changes to fair value of plan assets
Fair value of plan assets at beginning of year	77,603
Fair value of plan assets at end of year	72,912	77,603
PBO, ABO and fair value of plan assets
Projected benefit obligation	61,783	67,070
Accumulated benefit obligation	61,783	67,070
Fair value of plan assets	72,912	77,603
Overfunded (underfunded) portion of PBO/ABO	11,129	10,533
Defined Benefit Plan, Unfunded Plan [Member]
Changes to PBO or APBO
Benefit obligation at beginning of year	86,501
Benefit obligation at end of year	80,374	86,501
PBO, ABO and fair value of plan assets
Projected benefit obligation	80,374	86,501
Accumulated benefit obligation	80,374	86,501
Overfunded (underfunded) portion of PBO/ABO	(80,374)	(86,501)
Pension Plan [Member]
Changes to PBO or APBO
Benefit obligation at beginning of year	153,571	155,588
Interest cost	7,603	8,275	5,518
Actuarial (gain) loss	(4,166)	4,851
Benefit payments	(14,851)	(15,143)
Benefit obligation at end of year	142,157	153,571	155,588
Changes to fair value of plan assets
Fair value of plan assets at beginning of year	77,603	78,149
Actual return on plan assets	2,322	6,780
Benefit payments from trust	(7,013)	(7,326)
Fair value of plan assets at end of year	72,912	77,603	78,149
Funded status and amounts recognized in balance sheets
Pension assets for overfunded plans	11,129	10,533
Pension liabilities for underfunded plans	(80,374)	(86,501)
Funded status	(69,245)	(75,968)
PBO, ABO and fair value of plan assets
Projected benefit obligation	142,157	153,571	155,588
Accumulated benefit obligation	142,157	153,571
Fair value of plan assets	72,912	77,603	78,149
Overfunded (underfunded) portion of PBO/ABO	(69,245)	(75,968)
Other Postretirement Benefits Plan [Member]
Changes to PBO or APBO
Benefit obligation at beginning of year	16,784	16,425
Service cost	618	545
Interest cost	824	844	565
Actuarial (gain) loss	(963)	(542)
Benefit payments	(502)	(488)
Benefit obligation at end of year	16,761	16,784	16,425
Funded status and amounts recognized in balance sheets
Pension liabilities for underfunded plans	(16,761)	(16,784)
Funded status	(16,761)	(16,784)
PBO, ABO and fair value of plan assets
Projected benefit obligation	$ 16,761	$ 16,784	$ 16,425

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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