Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v3.22.4
Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies      
Environmental expenses $ 3,000 $ 3,100 $ 6,500
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Direct Operating Costs Direct Operating Costs Direct Operating Costs
Insurance proceeds receivable $ 3,600 $ 3,100  
Timing of future payments      
2023 52,258    
2024 12,550    
2025 11,581    
2026 11,300    
2027 1,350    
Thereafter 3,100    
Total 92,139    
Purchase Commitments      
Timing of future payments      
2023 40,841    
Total 40,841    
Surface Use and Compensation      
Timing of future payments      
2023 8,680    
2024 9,793    
2025 10,555    
2026 11,300    
2027 1,350    
Thereafter 3,100    
Total 44,778    
Fixed price power purchase contract      
Timing of future payments      
2023 2,737    
2024 2,757    
2025 1,026    
Total $ 6,520