Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue	$ 155,315	$ 137,469	$ 327,991	$ 303,829
Costs and expenses
Cost of sales (exclusive of items shown separately below)	122,770	99,199	262,483	209,748
Asset retirement obligations accretion	354	349	709	700
Depreciation, depletion, and amortization	15,879	13,556	31,098	25,407
Selling, general, and administrative	10,897	14,319	25,012	26,061
Total costs and expenses	149,900	127,423	319,302	261,916
Operating income	5,415	10,046	8,689	41,913
Other income (expense), net	2,522	2,495	3,151	3,742
Interest expense, net	(1,481)	(2,518)	(2,812)	(4,826)
Income before tax	6,456	10,023	9,028	40,829
Income tax expense	915	2,467	1,455	8,016
Net income	$ 5,541	$ 7,556	$ 7,573	$ 32,813
Earnings per common share
Basic (in dollars per share)	$ 0.08	$ 0.17	$ 0.08	$ 0.74
Diluted (in dollars per share)	$ 0.08	$ 0.17	$ 0.08	$ 0.73
Class A Common Stock
Costs and expenses
Net income	$ 3,435	$ 1,326	$ 3,329	$ 1,326
Earnings per common share
Basic (in dollars per share)	$ 0.08	$ 0.03	$ 0.08	$ 0.03
Diluted (in dollars per share)	$ 0.08	$ 0.03	$ 0.08	$ 0.03
Class B Common Stock
Costs and expenses
Net income	$ 1,541		$ 3,573
Earnings per common share
Basic (in dollars per share)	$ 0.18		$ 0.42
Diluted (in dollars per share)	$ 0.18		$ 0.41