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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues:        
Total revenues $ 625,156 $ 227,440 $ 1,003,808 $ 441,204
Costs and expenses:        
Cost of sales (exclusive of items shown separately below) 191,087 152,765 326,428 307,115
Cost of other revenues (exclusive of items shown separately below) 10,663 8,343 17,703 16,138
Depreciation and depletion 30,371 40,151 56,168 73,054
Selling, general and administrative 12,499 11,115 26,428 18,752
Business interruption 6,290 7,020 12,978 7,020
Idle mine 1,715 10,876 4,723 10,876
Total costs and expenses 252,625 230,270 444,428 432,955
Operating income (loss) 372,531 (2,830) 559,380 8,249
Interest expense, net (7,183) (8,477) (15,005) (17,170)
Other income (expense) 0 0 675 (109)
Income (loss) before income tax expense (benefit) 365,348 (11,307) 545,050 (9,030)
Income tax expense (benefit) 68,356 (6,626) 101,809 17,006
Net income (loss) $ 296,992 $ (4,681) $ 443,241 $ (26,036)
Basic and diluted net income (loss) per share:        
Net income (loss) per share-basic (in dollars per share) $ 5.75 $ (0.09) $ 8.59 $ (0.51)
Net income (loss) per share-diluted (in dollars per share) $ 5.74 $ (0.09) $ 8.58 $ (0.51)
Weighted average number of shares outstanding-basic (in shares) 51,646 51,449 51,591 51,362
Weighted average number of shares outstanding-diluted (in shares) 51,740 51,449 51,678 51,362
Dividends per share (in dollars per share) $ 0.56 $ 0.05 $ 0.62 $ 0.10
Sales        
Revenues:        
Total revenues $ 623,288 $ 224,759 $ 1,005,721 $ 431,748
Other revenues        
Revenues:        
Total revenues $ 1,868 $ 2,681 $ (1,913) $ 9,456