Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Commitments and Contingencies        
Purchase obligations and commitments   $ 21,100    
Environmental expenses   $ 4,600 $ 3,000 $ 3,100
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]   Direct Operating Costs Direct Operating Costs Direct Operating Costs
Insurance Settlements Receivable   $ 4,064 $ 3,600  
Insurance proceeds receivable   4,100 $ 3,600  
Timing of future payments        
2024   33,681    
2025   11,581    
2026   11,300    
2027   1,350    
2028   1,400    
Thereafter   1,700    
Total   61,012    
Purchase Commitments        
Timing of future payments        
2024   21,131    
Total   21,131    
Surface Use and Compensation        
Timing of future payments        
2024   9,793    
2025   10,555    
2026   11,300    
2027   1,350    
2028   1,400    
Thereafter   1,700    
Total   36,098    
Fixed price power purchase contract        
Timing of future payments        
2024   2,757    
2025   1,026    
Total   3,783    
Supply commitment        
Commitments and Contingencies        
Commitment agreement term 7 years      
Financial commitment $ 28,000      
Remaining minimum commitment   25,800    
Timing of future payments        
2024   4,000    
2025   4,000    
2026   4,000    
2027   4,000    
2028   4,000    
Thereafter   $ 5,800