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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Statement [Abstract]    
Revenues $ 237,708 $ 214,794
Cost of sales 207,952 200,203
Gross profit 29,756 14,591
Earnings of unconsolidated operations 57,476 49,994
Business interruption insurance recoveries 13,612 0
Operating expenses    
Selling, general and administrative expenses 69,754 65,616
Amortization of intangible assets 531 2,998
(Gain) loss on sale of assets (5,146) 221
Long-lived asset impairment charge 0 65,887
Operating expenses 65,139 134,722
Operating profit (loss) 35,705 (70,137)
Other expense (income)    
Interest expense 5,566 2,460
Interest income (4,428) (6,081)
Closed mine obligations 2,381 3,585
Gain on equity securities (1,805) (1,958)
Other, net 345 (3,985)
Other (income) expense 2,059 (5,979)
Income (loss) before income tax benefit 33,646 (64,158)
Income tax benefit (95) (24,571)
Net income (loss) $ 33,741 $ (39,587)
Earnings (loss) per share:    
Basic earnings (loss) per share (in dollars per share) $ 4.58 $ (5.29)
Diluted earnings (loss) per share (in dollars per share) $ 4.55 $ (5.29)
Basic weighted average shares outstanding (in shares) 7,363 7,478
Diluted weighted average shares outstanding (in shares) 7,411 7,478