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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues:    
Coal revenues $ 861,283 $ 906,698
Other revenues 2,789 4,537
Total revenues 864,072 911,235
Costs and expenses:    
Cost of coal sales (exclusive of items shown separately below) 648,313 539,137
Depreciation, depletion and amortization 40,701 29,423
Accretion on asset retirement obligations 6,143 6,377
Amortization of acquired intangibles, net 1,675 2,197
Selling, general and administrative expenses (exclusive of depreciation, depletion and amortization shown separately above) 22,377 20,692
Other operating loss (income) 2,985 (1,092)
Total costs and expenses 722,194 596,734
Income from operations 141,878 314,501
Other (expense) income:    
Interest expense (1,086) (1,720)
Interest income 3,971 1,518
Equity loss in affiliates (1,640) (1,748)
Miscellaneous (expense) income, net (1,963) 631
Total other expense, net (718) (1,319)
Income before income taxes 141,160 313,182
Income tax expense (14,165) (42,411)
Net income $ 126,995 $ 270,771
Basic income per common share (in dollars per share) $ 9.77 $ 17.74
Diluted income per common share (in dollars per share) $ 9.59 $ 17.01
Weighted average shares - basic (in shares) 13,002,127 15,266,895
Weighted average shares - diluted (in shares) 13,236,596 15,916,378