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Business Segments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
segment
Sep. 30, 2014
USD ($)
Business Segments        
Number of business segments | segment     2  
Business segments        
Revenues $ 37,029 $ 39,073 $ 99,543 $ 114,440
Depreciation, depletion and amortization 3,967 3,729 11,736 10,952
Gross profit 10,367 9,883 23,244 28,898
Capital expenditures 1,770 3,178 8,080 8,725
Lime and limestone operations        
Business segments        
Revenues 36,452 37,855 97,593 110,226
Depreciation, depletion and amortization 3,786 3,514 11,175 10,293
Gross profit 10,320 9,271 22,826 26,637
Capital expenditures 1,766 3,171 8,069 8,702
Natural gas interests        
Business segments        
Revenues 577 1,218 1,950 4,214
Depreciation, depletion and amortization 181 215 561 659
Gross profit 47 612 418 2,261
Capital expenditures $ 4 $ 7 $ 11 $ 23