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STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:      
Total revenues $ 1,525,220 $ 1,676,625 $ 1,738,738
Costs and expenses:      
Cost of sales (exclusive of items shown separately below) 1,007,297 910,269 710,605
Cost of other revenues (exclusive of items shown separately below) 45,449 37,486 27,047
Depreciation and depletion 153,982 127,356 115,279
Selling, general and administrative 63,078 51,817 48,791
Business interruption 524 8,291 23,455
Idle mine 0 0 12,137
Total costs and expenses 1,270,330 1,135,219 937,314
Operating income 254,890 541,406 801,424
Interest expense (4,271) (17,960) (31,433)
Interest income 33,047 40,699 12,438
Loss on early extinguishment of debt 0 (11,699) 0
Other (expense) income 0 (1,027) 675
Income before income tax expense 283,666 551,419 783,104
Income tax expense 33,063 72,790 141,806
Net income $ 250,603 $ 478,629 $ 641,298
Basic and diluted net income per share:      
Net income per share—basic (in dollars per share) $ 4.79 $ 9.21 $ 12.42
Net income per share—diluted (in dollars per share) $ 4.79 $ 9.20 $ 12.40
Weighted average number of shares outstanding—basic (in shares) 52,287 51,973 51,622
Weighted average number of shares outstanding— diluted (in shares) 52,345 52,045 51,715
Dividends declared (in dollars per share) $ 0.82 $ 1.16 $ 1.54
Sales      
Revenues:      
Total revenues $ 1,499,980 $ 1,647,992 $ 1,707,579
Other revenues      
Revenues:      
Total revenues $ 25,240 $ 28,633 $ 31,159