Benefit Plans - Changes to Benefit Obligations and Fair Value of Plan Assets and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Funded status and amounts recognized in balance sheets
Pension liabilities for underfunded plans	$ (134,491)	$ (143,373)
Funded Plan
Changes to PBO or APBO
Benefit obligation at beginning of year	98,558
Interest cost	2,261	2,946	$ 3,808
Benefit obligation at end of year	91,303	98,558
Changes to fair value of plan assets
Fair value of plan assets at beginning of year	114,795
Fair value of plan assets at end of year	106,648	114,795
PBO, ABO and fair value of plan assets
Projected benefit obligation	91,303	98,558
Accumulated benefit obligation	91,303	98,558
Fair value of plan assets	106,648	114,795
Overfunded (underfunded) portion of PBO/ABO	15,345	16,237
Unfunded Plan
Changes to PBO or APBO
Benefit obligation at beginning of year	120,834
Benefit obligation at end of year	113,129	120,834
PBO, ABO and fair value of plan assets
Projected benefit obligation	113,129	120,834
Accumulated benefit obligation	113,129	120,766
Overfunded (underfunded) portion of PBO/ABO	(113,129)	(120,834)
Pension Plan
Changes to PBO or APBO
Benefit obligation at beginning of year	219,392	213,285
Interest cost	5,065	6,519
Actuarial loss (gain)	(4,614)	14,935
Benefit payments	(15,411)	(15,347)
Benefit obligation at end of year	204,432	219,392	213,285
Changes to fair value of plan assets
Fair value of plan assets at beginning of year	114,795	112,659
Actual return on plan assets	(536)	9,637
Benefit payments from trust	(7,611)	(7,501)
Fair value of plan assets at end of year	106,648	114,795	112,659
Funded status and amounts recognized in balance sheets
Pension assets for overfunded plans	15,345	16,237
Pension liabilities for underfunded plans	(113,129)	(120,834)
Funded status	(97,784)	(104,597)
PBO, ABO and fair value of plan assets
Projected benefit obligation	204,432	219,392	213,285
Accumulated benefit obligation	204,432	219,324
Fair value of plan assets	106,648	114,795	112,659
Overfunded (underfunded) portion of PBO/ABO	(97,784)	(104,597)
Other Benefits
Changes to PBO or APBO
Benefit obligation at beginning of year	22,538	21,305
Service cost	874	768
Interest cost	515	640
Actuarial loss (gain)	(2,074)	303
Benefit payments	(491)	(478)
Benefit obligation at end of year	21,362	22,538	21,305
Funded status and amounts recognized in balance sheets
Pension liabilities for underfunded plans	(21,362)	(22,538)
Funded status	(21,362)	(22,538)
PBO, ABO and fair value of plan assets
Projected benefit obligation	$ 21,362	$ 22,538	$ 21,305

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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