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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The reconciliation of changes in the benefit obligation, plan assets and funded status of these plans at December 31, 2023 and 2022 is as follows:
 Pension Benefits
at December 31,		Other Postretirement Benefits at December 31,
 2023202220232022
Change in benefit obligation:    
Benefit obligation at beginning of period$524,212 $723,006 $255,029 $353,297 
Service cost1,217 1,207 — — 
Interest cost27,027 16,539 13,044 7,898 
Actuarial loss (gain)14,061 (173,233)(20,776)(84,810)
Benefits and other payments(41,431)(43,307)(20,062)(21,356)
Benefit obligation at end of period$525,086 $524,212 $227,235 $255,029 
     
Change in plan assets:    
Fair value of plan assets at beginning of period$540,225 $733,966 $— $— 
Actual return on plan assets49,239 (151,968)— — 
Company contributions1,538 1,534 20,062 21,356 
Benefits and other payments(41,431)(43,307)(20,062)(21,356)
Fair value of plan assets at end of period$549,571 $540,225 $— $— 
     
Funded status:    
Noncurrent assets$47,246 $38,548 $— $— 
Current liabilities(1,953)(1,950)(19,327)(22,436)
Noncurrent liabilities(20,808)(20,585)(207,908)(232,593)
Net asset (obligation) recognized$24,485 $16,013 $(227,235)$(255,029)
     
Amounts recognized in accumulated other comprehensive (loss) income consist of:    
Net actuarial loss (gain)$248,252 $244,700 $(26,249)$(5,473)
Prior service credit— — (11,329)(13,734)
Net amount recognized (before tax effect)$248,252 $244,700 $(37,578)$(19,207)
The reconciliation of changes in the benefit obligation and funded status of these plans at December 31, 2023 and 2022 is as follows:
 CWP
at December 31,		Workers' Compensation
at December 31,
 2023202220232022
Change in benefit obligation:    
Benefit obligation at beginning of period$161,113 $215,871 $50,344 $67,261 
State administrative fees and insurance bond premiums— — 1,953 1,817 
Service cost2,313 2,905 5,597 4,920 
Interest cost8,285 5,060 2,514 1,369 
Actuarial loss (gain)13,270 (46,498)(2,919)(14,422)
Benefits paid(14,967)(16,225)(9,336)(10,601)
Benefit obligation at end of period$170,014 $161,113 $48,153 $50,344 
     
Funded status:    
Current assets$— $— $1,010 $1,058 
Current liabilities(15,071)(12,723)(10,019)(10,451)
Noncurrent liabilities(154,943)(148,390)(39,144)(40,951)
Net obligation recognized$(170,014)$(161,113)$(48,153)$(50,344)
     
Amounts recognized in accumulated other comprehensive (loss) income consist of:    
Net actuarial loss (gain)$4,217 $(10,098)$(25,597)$(24,727)
Net amount recognized (before tax effect)$4,217 $(10,098)$(25,597)$(24,727)
Schedule of Net Benefit Costs
The components of net periodic benefit (credit) cost are as follows:
 Pension BenefitsOther Postretirement Benefits
 For the Years Ended December 31,For the Years Ended December 31,
 202320222021202320222021
Components of net periodic benefit (credit) cost:      
Service cost$1,217 $1,207 $1,114 $— $— $— 
Interest cost27,027 16,539 14,230 13,044 7,898 7,274 
Expected return on plan assets(39,470)(37,276)(42,168)— — — 
Amortization of prior service credits— — — (2,405)(2,405)(2,405)
Recognized net actuarial loss741 3,037 5,469 — 3,515 6,516 
Settlement loss recognized— — 22 — — — 
Net periodic benefit (credit) cost$(10,485)$(16,493)$(21,333)$10,639 $9,008 $11,385 
The components of net periodic benefit cost are as follows:
 CWP
For the Years Ended December 31,		Workers’ Compensation
For the Years Ended December 31,
 202320222021202320222021
Service cost$2,313 $2,905 $4,460 $5,597 $4,920 $4,236 
Interest cost8,285 5,060 4,710 2,514 1,369 1,127 
Recognized net actuarial (gain) loss(1,045)4,238 8,364 (2,049)(420)(179)
State administrative fees and insurance bond premiums— — — 1,953 1,817 1,778 
Net periodic benefit cost$9,553 $12,203 $17,534 $8,015 $7,686 $6,962 
Schedule of Defined Benefit Plan with Accumulated Benefit Obligation in Excess of Plan Assets
The following table provides information related to pension plans with an accumulated benefit obligation in excess of plan assets:
 As of December 31,
 20232022
Projected benefit obligation$22,762 $22,535 
Accumulated benefit obligation$22,464 $22,203 
Fair value of plan assets$— $— 
Schedule of Weighted-Average Assumptions
The weighted-average assumptions used to determine benefit obligations are as follows:
 Pension Obligations at
December 31,		Other Postretirement Obligations at
December 31,
 2023202220232022
Discount rate5.15 %5.41 %5.14 %5.43 %
Rate of compensation increase3.93 %3.89 %— — 
The weighted-average assumptions used to determine net periodic benefit costs are as follows:
Pension BenefitsOther Postretirement Benefits
 For the Years Ended
December 31,		For the Years Ended
December 31,
 202320222021202320222021
Discount rate5.41 %2.83 %2.46 %5.43 %2.79 %2.39 %
Expected long-term return on plan assets5.81 %4.75 %5.60 %— — — 
Rate of compensation increase3.89 %3.78 %3.76 %— — — 
Schedule of Health Care Cost Trend Rates
The assumed health care cost trend rates are as follows:
 At December 31,
 20232022
Health care cost trend rate for next year6.40 %6.78 %
Rate to which the cost trend is assumed to decline (ultimate trend rate)4.00 %4.00 %
Year that the rate reaches ultimate trend rate20482048
Schedule of Fair Value of Plan Assets
The fair values of plan assets at December 31, 2023 and 2022 by asset category are as follows:
 Fair Value Measurements at December 31, 2023Fair Value Measurements at December 31, 2022
 TotalQuoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		TotalQuoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
Asset Category        
Cash/Accrued Income$116 $116 $— $— $101 $101 $— $— 
Mercer Common Collective Trusts (a)549,455 — — — 540,124 — — — 
Total$549,571 $116 $— $— $540,225 $101 $— $— 
(a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the total.
Schedule of Expected Benefit Payments
The following benefit payments are expected to be paid in accordance with plan documents:
 Pension
Benefits		Other
Postretirement
Benefits
2024$40,937 $19,327 
2025$39,700 $19,207 
2026$41,409 $18,969 
2027$39,060 $18,490 
2028$38,717 $18,168 
Year 2029-2033$184,782 $85,644 
The following benefit payments, which reflect expected future claims as appropriate, are expected to be paid:
   Workers' Compensation
 CWP
Benefits		Total
Benefits		Actuarial
Benefits		Other
Benefits
2024$15,071 $10,932 $9,009 $1,923 
2025$14,305 $10,958 $8,987 $1,971 
2026$13,636 $11,220 $9,200 $2,020 
2027$12,909 $11,246 $9,175 $2,071 
2028$12,440 $11,575 $9,452 $2,123 
Year 2029-2033$59,950 $60,729 $49,293 $11,436