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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Revenues $ 46,546 $ 61,793 $ 158,037 $ 178,185
Cost of sales 48,720 43,965 150,447 128,867
Gross (loss) profit (2,174) 17,828 7,590 49,318
Earnings of unconsolidated operations 12,754 14,588 37,662 43,802
Contract termination settlement 0 0 0 14,000
Operating expenses        
Selling, general and administrative expenses 16,118 17,790 45,740 48,415
Amortization of intangible assets 642 867 2,296 2,772
Loss (gain) on sale of assets 87 2 (81) (2,451)
Asset impairment charges 0 3,939 0 3,939
Operating expenses 16,847 22,598 47,955 52,675
Operating (loss) profit (6,267) 9,818 (2,703) 54,445
Other (income) expense        
Interest expense 632 486 1,749 1,495
Interest income (1,679) (352) (4,548) (692)
Closed mine obligations 394 398 1,236 1,155
Loss (gain) on equity securities 551 316 (498) 1,676
Income from equity method investee 0 (2,156) 0 (2,156)
Other contract termination settlements 0 0 0 (16,882)
Other, net (315) (354) (2,417) (1,648)
Other (income) expense (417) (1,662) (4,478) (17,052)
(Loss) income before income tax (benefit) provision (5,850) 11,480 1,775 71,497
Income tax (benefit) provision (2,018) 866 (2,605) 11,121
Net (loss) income $ (3,832) $ 10,614 $ 4,380 $ 60,376
Earnings per share:        
Basic (loss) earnings per share (in dollars per share) $ (0.51) $ 1.45 $ 0.59 $ 8.27
Diluted (loss) earnings per share (in dollars per share) $ (0.51) $ 1.45 $ 0.58 $ 8.24
Basic weighted average shares outstanding (in shares) 7,517 7,337 7,480 7,302
Diluted weighted average shares outstanding (in shares) 7,517 7,337 7,515 7,329