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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]    
Revenues $ 241,719 $ 191,846
Cost of sales 173,877 148,394
Gross profit 67,842 43,452
Earnings of unconsolidated operations 57,250 60,843
Contract termination settlement 14,000 10,333
Operating expenses    
Selling, general and administrative expenses 63,911 55,722
Amortization of intangible assets 3,719 3,556
Gain on sale of assets (2,463) (60)
Asset impairment charges 3,939 0
Operating expenses 69,106 59,218
Operating profit 69,986 55,410
Other (income) expense    
Interest expense 2,034 1,719
Interest income (1,449) (449)
Closed mine obligations 1,179 1,297
Loss (gain) on equity securities 283 (3,423)
Income from equity method investee (2,194) 0
Other contract termination settlements (16,882) 0
Other, net (708) (584)
Other (income) expense (17,737) (1,440)
Income before income tax provision 87,723 56,850
Income tax provision 13,565 8,725
Net income $ 74,158 $ 48,125
Earnings per share:    
Basic earnings per share (in dollars per share) $ 10.14 $ 6.73
Diluted earnings per share (in dollars per share) $ 10.06 $ 6.69
Basic weighted average shares outstanding (in shares) 7,312 7,146
Diluted weighted average shares outstanding (in shares) 7,373 7,190