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SEGMENTS OF BUSINESS - Schedule of EBITDA Margin to Income (loss) before Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
SEGMENTS OF BUSINESS        
Other Operating Revenue $ 2,355 $ 1,377 $ 8,780 $ 3,685
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)
Gain (loss) on disposal or abandonment of assets, net 2,334 290 2,410 536
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)
Corporate - General and Administrative (1,400) (3,136) (8,834) (8,446)
Corporate - Other Operating and Maintenance Costs   (114)   (337)
NET INCOME (LOSS) BEFORE INCOME TAXES 23,884 1,786 42,111 (13,735)
Electric sales        
SEGMENTS OF BUSINESS        
EBITDA Margin 44,117 41,083 115,993 102,813
Coal sales        
SEGMENTS OF BUSINESS        
EBITDA Margin (8,721) (20,478) (32,354) (53,775)
Operating Segment | Electric Operations        
SEGMENTS OF BUSINESS        
EBITDA Margin 25,911 24,085 67,671 55,408
Other Operating Revenue 192 187 3,413 518
Depreciation, Depletion and Amortization (5,131) (4,802) (15,456) (14,197)
Asset Retirement Obligations Accretion (126) (115) (369) (339)
Interest Expense (2,585) (181) (6,208) (515)
NET INCOME (LOSS) BEFORE INCOME TAXES 18,261 19,174 49,051 40,875
Operating Segment | Electric Operations | Electric sales        
SEGMENTS OF BUSINESS        
EBITDA Margin 25,911 24,085 67,671 55,408
Operating Segment | Coal Operations        
SEGMENTS OF BUSINESS        
EBITDA Margin 8,837 (3,820) 17,175 (7,802)
Other Operating Revenue 1,647 721 4,370 2,028
Depreciation, Depletion and Amortization (3,992) (9,013) (14,148) (28,671)
Asset Retirement Obligations Accretion (320) (295) (941) (869)
Exploration Costs (38) (62) (157) (179)
Gain (loss) on disposal or abandonment of assets, net 2,334 290 2,410 536
Interest Expense (2,342) (2,511) (6,261) (8,908)
NET INCOME (LOSS) BEFORE INCOME TAXES 6,126 (14,690) 2,448 (43,865)
Operating Segment | Coal Operations | Coal sales        
SEGMENTS OF BUSINESS        
EBITDA Margin 8,837 (3,820) 17,175 (7,802)
Corporate and Other and Eliminations        
SEGMENTS OF BUSINESS        
Other Operating Revenue 516 469 997 1,139
Depreciation, Depletion and Amortization (19) (23) (57) (62)
Interest Expense       (941)
Loss on Extinguishment of Debt       (2,790)
Equity Method Investment (Loss) (248) (234) (287) (740)
Corporate - General and Administrative (1,400) (3,136) (8,834) (8,446)
Corporate - Other Operating and Maintenance Costs   (114)   (337)
NET INCOME (LOSS) BEFORE INCOME TAXES (503) (2,698) (9,388) (10,745)
Corporate and Other and Eliminations | Electric sales        
SEGMENTS OF BUSINESS        
EBITDA Margin 18,206 16,998 48,322 47,405
Corporate and Other and Eliminations | Coal sales        
SEGMENTS OF BUSINESS        
EBITDA Margin $ (17,558) $ (16,658) $ (49,529) $ (45,973)