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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
segment
Mar. 31, 2013
Business Segments    
Number of business segments 2  
Business segments    
Revenues $ 36,691 $ 31,585
Depreciation, depletion and amortization 3,556 3,653
Gross profit 8,592 6,291
Capital expenditures 2,920 1,519
Lime and limestone operations
   
Business segments    
Revenues 35,051 30,155
Depreciation, depletion and amortization 3,342 3,380
Gross profit 7,662 5,667
Capital expenditures 2,916 1,515
Natural gas interests
   
Business segments    
Revenues 1,640 1,430
Depreciation, depletion and amortization 224 273
Gross profit 930 624
Capital expenditures $ 4 $ 4