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Business Segments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Business segments        
Number of business segments | segment     2  
Revenues $ 36,934 $ 38,650 $ 109,605 $ 105,116
Depreciation, depletion and amortization 4,240 4,017 12,530 11,855
Gross profit (loss) 9,552 10,569 26,628 25,658
Capital expenditures 6,362 4,330 14,504 12,230
Lime and limestone operations        
Business segments        
Revenues 36,428 38,096 107,910 103,626
Depreciation, depletion and amortization 4,048 3,827 11,935 11,279
Gross profit (loss) 9,476 10,503 26,218 25,677
Capital expenditures 6,362 4,320 14,502 12,216
Natural gas interests        
Business segments        
Revenues 506 554 1,695 1,490
Depreciation, depletion and amortization 192 190 595 576
Gross profit (loss) $ 76 66 410 (19)
Capital expenditures   $ 10 $ 2 $ 14