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Business Segments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Business segments        
Number of business segments | segment     2  
Revenues $ 32,880 $ 32,450 $ 66,466 $ 62,514
Depreciation, depletion and amortization 3,929 3,885 7,838 7,769
Gross profit 7,241 7,013 15,089 12,877
Capital expenditures 3,966 2,886 7,900 6,310
Lime and limestone operations        
Business segments        
Revenues 32,376 31,779 65,530 61,141
Depreciation, depletion and amortization 3,738 3,697 7,452 7,389
Gross profit 7,245 6,809 15,174 12,506
Capital expenditures 3,966 2,883 7,896 6,303
Natural gas interests        
Business segments        
Revenues 504 671 936 1,373
Depreciation, depletion and amortization 191 188 386 380
Gross profit $ (4) 204 (85) 371
Capital expenditures   $ 3 $ 4 $ 7