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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss $ 32,725 $ 20,029
Power contracts 10,828 23,302
Compensation 1,955 2,287
Accrued liabilities 423 570
ARO liabilities 2,293 2,798
Lease liabilities 3,938 3,044
Coal properties 26,191  
Other 5,215 2,016
Total deferred tax assets 83,568 54,046
Valuation allowance (49,695)  
Deferred tax assets, net of valuation allowance 33,873 54,046
Deferred tax liabilities:    
Coal properties   (28,535)
Power properties (27,960) (31,126)
Investment partnerships (531) (549)
ROU assets (5,382) (3,071)
Total deferred tax liabilities $ (33,873) (63,281)
Net deferred tax liability   $ 9,235