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UNAUDITED CONDENSED CONSOLIDATED 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
Income Statement [Abstract]        
Revenues $ 61,656 $ 46,546 $ 167,290 $ 158,037
Cost of sales 54,412 48,720 146,010 150,447
Gross profit (loss) 7,244 (2,174) 21,280 7,590
Earnings of unconsolidated operations 15,155 12,754 42,054 37,662
Business interruption insurance recoveries 13,612 0 13,612 0
Operating expenses        
Selling, general and administrative expenses 16,487 16,118 49,660 45,740
Amortization of intangible assets 131 642 373 2,296
(Gain) loss on sale of assets (306) 87 (4,909) (81)
Operating expenses 16,312 16,847 45,124 47,955
Operating profit (loss) 19,699 (6,267) 31,822 (2,703)
Other expense (income)        
Interest expense 1,386 632 3,808 1,749
Interest income (1,084) (1,679) (3,249) (4,548)
Closed mine obligations 463 394 1,389 1,236
(Gain) loss on equity securities (442) 551 (1,219) (498)
Other, net 244 (315) 160 (2,417)
Other (income) expense 567 (417) 889 (4,478)
Income (loss) before income tax provision (benefit) 19,132 (5,850) 30,933 1,775
Income tax provision (benefit) 3,497 (2,018) 4,756 (2,605)
Net income (loss) $ 15,635 $ (3,832) $ 26,177 $ 4,380
Earnings per share:        
Basic earnings (loss) per share (in dollars per share) $ 2.14 $ (0.51) $ 3.55 $ 0.59
Diluted earnings (loss) per share (in dollars per share) $ 2.14 $ (0.51) $ 3.54 $ 0.58
Basic weighted average shares outstanding (in shares) 7,312 7,517 7,383 7,480
Diluted weighted average shares outstanding (in shares) 7,312 7,517 7,395 7,515