CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Total revenues	$ 327,720	$ 423,487	$ 1,227,755	$ 1,312,821
Costs and expenses:
Cost of sales (exclusive of items shown separately below)	231,598	260,376	778,489	723,458
Cost of other revenues (exclusive of items shown separately below)	8,854	9,855	29,491	32,803
Depreciation and depletion	36,642	34,020	114,815	101,783
Selling, general and administrative	11,403	11,138	45,452	38,826
Business interruption	107	347	409	8,101
Total costs and expenses	288,604	315,736	968,656	904,971
Operating income	39,116	107,751	259,099	407,850
Interest expense	(1,422)	(3,418)	(3,458)	(16,313)
Interest income	8,679	10,691	26,074	31,235
Loss on early extinguishment of debt	0	(11,699)	0	(11,699)
Other expense	0	(1,102)	0	(881)
Income before income tax expense	46,373	102,223	281,715	410,192
Income tax expense	4,607	16,841	32,248	60,439
Net income	$ 41,766	$ 85,382	$ 249,467	$ 349,753
Basic and diluted net income per share:
Net income per share-basic (in dollars per share)	$ 0.80	$ 1.64	$ 4.78	$ 6.73
Net income per share-diluted (in dollars per share)	$ 0.80	$ 1.64	$ 4.78	$ 6.72
Weighted average number of shares outstanding-basic (in shares)	52,330	52,019	52,167	51,958
Weighted average number of shares outstanding-diluted (in shares)	52,394	52,111	52,221	52,028
Dividends per share (in dollars per share)	$ 0.08	$ 0.07	$ 0.74	$ 1.09
Sales
Revenues:
Total revenues	$ 319,944	$ 416,888	$ 1,208,366	$ 1,288,412
Other revenues
Revenues:
Total revenues	$ 7,776	$ 6,599	$ 19,389	$ 24,409