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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Revenues $ 41,352 $ 33,681 $ 81,449 $ 64,881
Cost of sales 32,684 28,835 59,396 54,611
Gross profit 8,668 4,846 22,053 10,270
Earnings of unconsolidated operations 14,143 15,423 30,413 30,978
Operating expenses        
Selling, general and administrative expenses 12,788 11,863 25,441 22,490
Amortization of intangible assets 881 814 1,528 1,498
Gain on sale of assets (19) (210) (37) (263)
Operating expenses 13,650 12,467 26,932 23,725
Operating profit 9,161 7,802 25,534 17,523
Other (income) expense        
Interest expense 222 569 453 1,215
Interest income (581) (119) (1,134) (232)
Income from other unconsolidated affiliates (323) (318) (645) (633)
Closed mine obligations 330 343 696 722
Gain on equity securities (261) (183) (959) (85)
Other, net 11 (71) 22 (25)
Other (income) expense (602) 221 (1,567) 962
Income before income tax provision 9,763 7,581 27,101 16,561
Income tax provision 1,788 1,188 4,108 1,992
Net income $ 7,975 $ 6,393 $ 22,993 $ 14,569
Earnings per share:        
Basic earnings per share (in dollars per share) $ 1.14 $ 0.92 $ 3.30 $ 2.11
Diluted earnings per share (in dollars per share) $ 1.14 $ 0.92 $ 3.29 $ 2.10
Basic weighted average shares outstanding (in shares) 6,986 6,940 6,965 6,914
Diluted weighted average shares outstanding (in shares) 6,986 6,940 6,993 6,939