Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
SALES AND OPERATING REVENUES:
Other revenues	$ 5,419	$ 5,025
Total sales and operating revenues	404,394	634,878
EXPENSES:
Fuel	49,343	103,388
Other operating and maintenance costs	118,364	199,855
Cost of purchased power	10,888
Utilities	15,914	17,730
Labor	116,164	152,417
Depreciation, depletion and amortization	65,626	67,211
Asset retirement obligations accretion	1,628	1,804
Exploration costs	260	904
General and administrative	26,527	26,159
Asset impairment	215,136	0
(Gain) loss on disposal or abandonment of assets, net	(50)	398
Settlement of litigation	2,750
Total operating expenses	622,550	569,866
INCOME (LOSS) FROM OPERATIONS	(218,156)	65,012
Interest expense (1)	(13,850)	(13,711)
Loss on extinguishment of debt	(2,790)	(1,491)
Equity method investment (loss)	(746)	(552)
NET INCOME (LOSS) BEFORE INCOME TAXES	(235,542)	49,258
INCOME TAX EXPENSE (BENEFIT):
Current	(169)	(164)
Deferred	(9,235)	4,629
Total income tax expense (benefit)	(9,404)	4,465
NET INCOME (LOSS)	$ (226,138)	$ 44,793
NET INCOME (LOSS) PER SHARE:
Basic (in dollar per share)	$ (5.72)	$ 1.35
Diluted (in dollar per share)	$ (5.72)	$ 1.25
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	39,504	33,133
Diluted (in shares)	39,504	36,827
Interest Expense:
Interest on bank debt	$ 9,286	$ 8,636
Other interest	2,817	1,842
Amortization:
Amortization of debt issuance costs	1,747	3,233
Total amortization	1,747	3,233
Total interest expense	13,850	13,711
Electric sales
SALES AND OPERATING REVENUES:
Revenues	261,527	267,927
Coal sales
SALES AND OPERATING REVENUES:
Revenues	$ 137,448	$ 361,926