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Coal Workers' Pneumoconiosis and Workers' Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
Compensation Related Costs [Abstract]  
Schedule of Changes in Benefit Obligation and Funded Status
The reconciliation of changes in the benefit obligation, plan assets and funded status of these plans is as follows:
Pension BenefitsOther Postretirement Benefits
 December 31,December 31,
 2025202420252024
Change in benefit obligation:    
Benefit obligation at beginning of period$491,664 $525,086 $194,138 $227,235 
Service cost1,100 1,208 146 — 
Interest cost25,373 25,724 11,876 11,031 
Benefit obligations assumed in Merger894 — 41,365 — 
Plan curtailments— (217)— — 
Actuarial loss (gain)11,094 (14,615)(23,753)(27,445)
Benefits and other payments(41,073)(45,522)(18,233)(16,683)
Benefit obligation at end of period$489,052 $491,664 $205,539 $194,138 
     
Change in plan assets:    
Fair value of plan assets at beginning of period$511,472 $549,571 $— $— 
Actual return on plan assets43,278 5,695 — — 
Company contributions1,730 1,728 18,233 16,683 
Benefits and other payments(41,073)(45,522)(18,233)(16,683)
Fair value of plan assets at end of period$515,407 $511,472 $— $— 
     
Funded status:    
Noncurrent assets$49,618 $41,938 $— $— 
Current liabilities(2,152)(2,057)(18,696)(17,887)
Noncurrent liabilities(21,111)(20,073)(186,843)(176,251)
Net asset (obligation) recognized$26,355 $19,808 $(205,539)$(194,138)
     
Amounts recognized in accumulated other comprehensive (loss) income consist of:    
Net actuarial loss (gain)$243,082 $253,641 $(74,435)$(53,416)
Prior service credit— — (6,519)(8,924)
Net amount recognized (before tax effect)$243,082 $253,641 $(80,954)$(62,340)
The reconciliation of changes in the benefit obligation and funded status of these plans is as follows:
CWPWorkers’ Compensation
 December 31,December 31,
 2025202420252024
Change in benefit obligation:    
Benefit obligation at beginning of period$161,878 $170,014 $46,107 $48,153 
State administrative fees and insurance bond premiums— — 1,730 1,837 
Service cost7,812 2,985 6,912 5,857 
Interest cost14,462 8,264 2,220 2,289 
Benefit obligations assumed in Merger118,585 — — — 
Actuarial loss (gain)11,293 (2,145)1,521 1,203 
Benefits paid(28,290)(17,240)(11,682)(13,232)
Benefit obligation at end of period$285,740 $161,878 $46,808 $46,107 
     
Funded status:    
Current assets$— $— $766 $1,000 
Current liabilities(24,539)(16,389)(12,611)(11,056)
Noncurrent liabilities(261,201)(145,489)(34,963)(36,051)
Net obligation recognized$(285,740)$(161,878)$(46,808)$(46,107)
     
Amounts recognized in accumulated other comprehensive (loss) income consist of:    
Net actuarial loss (gain)$12,761 $1,638 $(18,874)$(22,234)
Net amount recognized (before tax effect)$12,761 $1,638 $(18,874)$(22,234)
Schedule of Net Benefit Cost (Credit)
The components of net periodic benefit cost (credit) are as follows:
 Pension BenefitsOther Postretirement Benefits
 Year Ended December 31,Year Ended December 31,
 202520242023202520242023
Service cost$1,100 $1,208 $1,217 $146 $— $— 
Interest cost25,373 25,724 27,027 11,876 11,031 13,044 
Expected return on plan assets(30,258)(31,964)(39,470)— — — 
Amortization of prior service credits— — — (2,405)(2,405)(2,405)
Recognized net actuarial loss (gain)8,633 6,265 741 (2,734)(278)— 
Curtailment gain recognized— (217)— — — — 
Net periodic benefit cost (credit)$4,848 $1,016 $(10,485)$6,883 $8,348 $10,639 
The components of net periodic benefit cost are as follows:
CWPWorkers’ Compensation
 Year Ended December 31,Year Ended December 31,
 202520242023202520242023
Service cost$7,812 $2,985 $2,313 $6,912 $5,857 $5,597 
Interest cost14,462 8,264 8,285 2,220 2,289 2,514 
Recognized net actuarial loss (gain)170 434 (1,045)(1,839)(2,160)(2,049)
State administrative fees and insurance bond premiums— — — 1,730 1,837 1,953 
Net periodic benefit cost$22,444 $11,683 $9,553 $9,023 $7,823 $8,015 
Insured workers’ compensation fees and assessments6,407 — — 
Total workers’ compensation expense$15,430 $7,823 $8,015 
Schedule of Assumptions
The weighted-average discount rates used to determine benefit obligations and net periodic benefit costs are as follows:
CWPWorkers’ Compensation
 Year Ended December 31,Year Ended December 31,
 202520242023202520242023
Benefit obligations5.57 %5.65 %5.14 %5.36 %5.58 %5.12 %
Net periodic benefit cost5.65 %5.14 %5.40 %5.58 %5.12 %5.38 %
 Year Ended December 31,
 202520242023
Net periodic benefit costs$663$869$534
Discount rate assumption used to determine net periodic benefit costs5.29 %5.03 %5.34 %
Schedule of Expected Benefit Payments
The following benefit payments are expected to be paid in accordance with plan documents:
 Pension
Benefits		Other
Postretirement
Benefits
2026$40,158 $18,696 
2027$38,764 $18,261 
2028$38,937 $17,941 
2029$38,581 $17,458 
2030$37,355 $17,053 
Years 2031-2035$180,360 $80,352 
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
2026$24,539 $13,460 $11,845 $1,615 
2027$23,669 $15,222 $13,566 $1,656 
2028$22,956 $16,397 $14,700 $1,697 
2029$22,207 $17,182 $15,442 $1,740 
2030$21,682 $17,835 $16,052 $1,783 
Years 2031-2035$108,676 $98,643 $89,036 $9,607