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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

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- Definition This item represents the entity's proportionate share for the period of the pre-tax earnings of the unconsolidated mines to which the equity method of accounting is applied. Income tax amounts are included in the income tax provision line. + References No definition available. + Details
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