Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue	$ 186,966	$ 136,925	$ 490,795	$ 430,461
Costs and expenses
Cost of sales (exclusive of items shown separately below)	144,635	79,634	354,383	237,530
Asset retirement obligations accretion	349	495	1,049	1,485
Depreciation, depletion, and amortization	14,443	11,435	39,850	29,898
Selling, general, and administrative	11,458	8,672	37,519	29,282
Total costs and expenses	170,885	100,236	432,801	298,195
Operating income	16,081	36,689	57,994	132,266
Other income (expense), net	11,333	(933)	15,076	1,781
Interest expense, net	(2,447)	(2,255)	(7,274)	(5,323)
Income before tax	24,967	33,501	65,796	128,724
Income tax expense	5,505	6,596	13,521	27,068
Net income	$ 19,462	$ 26,905	$ 52,275	$ 101,656
Earnings per share
Basic (in dollars per share)	$ 0.41	$ 0.61	$ 1.15	$ 2.30
Diluted (in dollars per share)	$ 0.40	$ 0.60	$ 1.14	$ 2.27
Class A Common Stock
Costs and expenses
Net income	$ 17,288
Earnings per share
Basic (in dollars per share)	$ 0.41
Diluted (in dollars per share)	$ 0.40
Class B Common Stock
Costs and expenses
Net income	$ 1,395
Earnings per share
Basic (in dollars per share)	$ 0.17
Diluted (in dollars per share)	$ 0.16