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Business Segments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Business Segments    
Number of business segments | segment 2  
Business segments    
Revenues $ 33,586 $ 30,064
Depreciation, depletion and amortization 3,909 3,884
Gross profit 7,848 5,864
Capital expenditures 3,935 3,424
Lime and limestone operations    
Business segments    
Revenues 33,154 29,362
Depreciation, depletion and amortization 3,714 3,692
Gross profit 7,929 5,697
Capital expenditures 3,931 3,420
Natural gas interests    
Business segments    
Revenues 432 702
Depreciation, depletion and amortization 195 192
Gross profit (81) 167
Capital expenditures $ 4 $ 4