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SEGMENTS OF BUSINESS - Income Loss Before Taxes Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
SEGMENTS OF BUSINESS      
Other Operating Revenue   $ 5,419 $ 5,025
Amortization of Contract Asset     (26,581)
Depreciation, Depletion and Amortization   (65,626) (67,211)
Asset Impairment $ (215,100) (215,136) 0
Asset Retirement Obligations Accretion   (1,628) (1,804)
Exploration Costs   (260) (904)
Gain (loss) on disposal or abandonment of assets, net   50 (398)
Interest expense (1)   (13,850) (13,711)
Loss on Extinguishment of Debt   (2,790) (1,491)
Equity Method Investment (Loss)   (746) (552)
Settlement of litigation   (2,750)  
Corporate - General and Administrative   (11,339) (10,958)
Corporate - Other Operating and Maintenance Costs   (440) (568)
NET INCOME (LOSS) BEFORE INCOME TAXES   (235,542) 49,258
Electric sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   137,283 127,812
Coal sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   (63,729) 40,599
Operating Segment | Electric Operations      
SEGMENTS OF BUSINESS      
EBITDA Margin   72,007 58,034
Other Operating Revenue   982 414
Amortization of Contract Asset     (26,581)
Depreciation, Depletion and Amortization   (19,290) (18,739)
Asset Retirement Obligations Accretion   (457) (576)
Interest expense (1)   (1,875) (322)
NET INCOME (LOSS) BEFORE INCOME TAXES   51,367 12,230
Operating Segment | Electric Operations | Electric sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   72,007 58,034
Operating Segment | Coal Operations      
SEGMENTS OF BUSINESS      
EBITDA Margin   1,348 111,560
Other Operating Revenue   2,756 2,936
Depreciation, Depletion and Amortization   (46,245) (48,365)
Asset Impairment   (215,136)  
Asset Retirement Obligations Accretion   (1,171) (1,228)
Exploration Costs   (260) (904)
Gain (loss) on disposal or abandonment of assets, net   (1,629) (398)
Interest expense (1)   (11,033) (11,869)
Loss on Extinguishment of Debt     (1,491)
Settlement of litigation   (2,750)  
NET INCOME (LOSS) BEFORE INCOME TAXES   (274,120) 50,241
Operating Segment | Coal Operations | Coal sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   1,348 111,560
Corporate and Other and Eliminations      
SEGMENTS OF BUSINESS      
Other Operating Revenue   1,681 1,675
Depreciation, Depletion and Amortization   (91) (107)
Gain (loss) on disposal or abandonment of assets, net   1,679  
Interest expense (1)   (942) (1,520)
Loss on Extinguishment of Debt   (2,790)  
Equity Method Investment (Loss)   (746) (552)
Corporate - General and Administrative   (11,339) (10,958)
Corporate - Other Operating and Maintenance Costs   (440) (568)
NET INCOME (LOSS) BEFORE INCOME TAXES   (12,789) (13,213)
Corporate and Other and Eliminations | Electric sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   65,276 69,778
Corporate and Other and Eliminations | Coal sales      
SEGMENTS OF BUSINESS      
EBITDA Margin   $ (65,077) $ (70,961)