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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
SALES AND OPERATING REVENUES:        
Other revenues $ 2,355 $ 1,377 $ 8,780 $ 3,685
Total sales and operating revenues 146,846 105,155 367,522 310,774
EXPENSES:        
Fuel 27,119 13,755 57,392 34,684
Other operating and maintenance costs 44,415 32,741 101,759 103,704
Cost of purchased power 2,074 3,149 11,086 7,694
Utilities 4,543 3,586 13,202 12,090
Labor 27,574 26,721 81,402 88,444
Depreciation, depletion and amortization 9,142 13,838 29,661 42,930
Asset retirement obligations accretion 446 410 1,310 1,208
Exploration costs 38 62 157 179
General and administrative 4,770 6,471 19,096 20,218
Gain on disposal or abandonment of assets, net (2,334) (290) (2,410) (536)
Total operating expenses 117,787 100,443 312,655 310,615
INCOME FROM OPERATIONS 29,059 4,712 54,867 159
Interest expense (4,927) (2,692) (12,469) (10,364)
Loss on extinguishment of debt       (2,790)
Equity method investment (loss) (248) (234) (287) (740)
NET INCOME (LOSS) BEFORE INCOME TAXES 23,884 1,786 42,111 (13,735)
INCOME TAX EXPENSE (BENEFIT):        
Deferred   232   (3,389)
Total income tax expense (benefit)   232   (3,389)
NET INCOME (LOSS) $ 23,884 $ 1,554 $ 42,111 $ (10,346)
NET INCOME (LOSS) PER SHARE:        
Basic (in dollar per share) $ 0.56 $ 0.04 $ 0.98 $ (0.27)
Diluted (in dollar per share) $ 0.55 $ 0.04 $ 0.97 $ (0.27)
WEIGHTED AVERAGE SHARES OUTSTANDING        
Basic (in shares) 43,007 42,598 42,869 38,455
Diluted (in shares) 43,434 43,018 43,287 38,455
Interest Expense:        
Interest on bank debt $ 1,763 $ 2,073 $ 4,661 $ 7,657
Other interest 2,585 181 6,208 1,456
Amortization of debt issuance costs 579 438 1,600 1,251
Total interest expense 4,927 2,692 12,469 10,364
Electric sales        
SALES AND OPERATING REVENUES:        
Revenues 93,235 72,116 239,154 192,996
Coal sales        
SALES AND OPERATING REVENUES:        
Revenues $ 51,256 $ 31,662 $ 119,588 $ 114,093