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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenues $ 37,644 $ 40,097
Cost of sales 32,563 26,712
Gross profit 5,081 13,385
Earnings of unconsolidated operations 16,003 16,270
Operating expenses    
Selling, general and administrative expenses 12,727 12,653
Amortization of intangible assets 777 647
Gain on sale of assets 0 (18)
Operating expenses 13,504 13,282
Operating profit 7,580 16,373
Other expense (income)    
Interest expense 403 231
Interest income (401) (553)
Income from other unconsolidated affiliates (133) (322)
Closed mine obligations 434 366
Loss (gain) on equity securities 1,196 (698)
Other, net (15) 11
Other (income) expense 1,484 (965)
Income before income tax (benefit) provision 6,096 17,338
Income tax (benefit) provision (70) 2,320
Net income $ 6,166 $ 15,018
Earnings per share:    
Basic earnings per share (in dollars per share) $ 0.88 $ 2.16
Diluted earnings per share (in dollars per share) $ 0.88 $ 2.15
Basic weighted average shares outstanding (in shares) 7,000 6,949
Diluted weighted average shares outstanding (in shares) 7,040 6,998