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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Revenues $ 168,582 $ 173,421
Cost of sales 129,447 133,416
Gross profit 39,135 40,005
Earnings of unconsolidated mines 14,955 12,648
Operating expenses    
Selling, general and administrative expenses 45,790 46,259
Amortization of intangible assets 932 982
Operating expenses 46,722 47,241
Operating profit 7,368 5,412
Other expense (income)    
Interest expense 1,347 1,505
Income from other unconsolidated affiliates (308) (303)
Closed mine obligations 383 376
Other, net, including interest income (702) 53
Other (income) expense 720 1,631
Income before income tax provision 6,648 3,781
Income tax provision 1,670 979
Net income $ 4,978 $ 2,802
Earnings Per Share [Abstract]    
Basic earnings per share (in dollars per share) $ 0.73 $ 0.41
Diluted earnings per share (in dollars per share) 0.73 0.41
Dividends per share (in dollars per share) $ 0.2675 $ 0.2625
Basic weighted average shares outstanding (in shares) 6,806 6,857
Diluted weighted average shares outstanding (in shares) 6,843 6,885