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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segment
Sep. 30, 2013
Business Segments        
Number of business segments     2  
Business segments        
Revenues $ 39,073 $ 36,899 $ 114,440 $ 103,656
Depreciation, depletion and amortization 3,729 3,589 10,952 10,841
Gross profit 9,883 9,110 28,898 24,365
Capital expenditures 3,178 2,678 8,725 6,690
Lime and limestone operations
       
Business segments        
Revenues 37,855 35,498 110,226 99,337
Depreciation, depletion and amortization 3,514 3,334 10,293 10,048
Gross profit 9,271 8,409 26,637 22,439
Capital expenditures 3,171 2,657 8,702 6,636
Natural gas interests
       
Business segments        
Revenues 1,218 1,401 4,214 4,319
Depreciation, depletion and amortization 215 255 659 793
Gross profit 612 701 2,261 1,926
Capital expenditures $ 7 $ 21 $ 23 $ 54