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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Revenues $ 40,097 $ 31,200
Cost of sales 26,712 25,776
Gross profit 13,385 5,424
Earnings of unconsolidated operations 16,270 15,555
Operating expenses    
Selling, general and administrative expenses 12,653 10,627
Amortization of intangible assets 647 684
Gain on sale of assets (18) (53)
Operating expenses 13,282 11,258
Operating profit 16,373 9,721
Other (income) expense    
Interest expense 231 646
Interest income (553) (113)
Income from other unconsolidated affiliates (322) (315)
Closed mine obligations 366 379
(Gain) loss on equity securities (698) 98
Other, net 11 46
Other (income) expense (965) 741
Income before income tax provision 17,338 8,980
Income tax provision 2,320 804
Net income $ 15,018 $ 8,176
Earnings per share:    
Basic earnings per share (in dollars per share) $ 2.16 $ 1.19
Diluted earnings per share (in dollars per share) $ 2.15 $ 1.18
Basic weighted average shares outstanding (in shares) 6,949 6,894
Diluted weighted average shares outstanding (in shares) 6,998 6,939