Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 167,411	$ 186,966	$ 495,403	$ 490,795
Costs and expenses
Cost of sales (exclusive of items shown separately below)	134,731	144,635	397,214	354,383
Asset retirement obligations accretion	354	349	1,063	1,049
Depreciation, depletion, and amortization	17,811	14,443	48,909	39,850
Selling, general, and administrative	12,921	11,458	37,932	37,519
Total costs and expenses	165,817	170,885	485,118	432,801
Operating income	1,594	16,081	10,285	57,994
Other income (expense), net	(76)	11,333	3,075	15,076
Interest expense, net	(1,696)	(2,447)	(4,509)	(7,274)
Income (loss) before tax	(178)	24,967	8,851	65,796
Income tax expense	61	5,505	1,517	13,521
Net income (loss)	$ (239)	$ 19,462	$ 7,334	$ 52,275
Earnings (loss) per common share
Basic (in dollars per share)	$ (0.03)	$ 0.41	$ 0.05	$ 1.15
Diluted (in dollars per share)	$ (0.03)	$ 0.40	$ 0.05	$ 1.14
Class A Common Stock
Costs and expenses
Net income (loss)	$ (1,245)	$ 17,288	$ 2,085	$ 18,616
Earnings (loss) per common share
Basic (in dollars per share)	$ (0.03)	$ 0.41	$ 0.05	$ 0.44
Diluted (in dollars per share)	$ (0.03)	$ 0.40	$ 0.05	$ 0.44
Class B Common Stock
Costs and expenses
Net income (loss)	$ 507	$ 1,395	$ 4,079	$ 1,395
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.06	$ 0.17	$ 0.48	$ 0.17
Diluted (in dollars per share)	$ 0.06	$ 0.16	$ 0.46	$ 0.16