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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
segment
Jun. 30, 2013
Business Segments        
Number of business segments     2  
Business segments        
Revenues $ 38,676 $ 35,172 $ 75,367 $ 66,757
Depreciation, depletion and amortization 3,667 3,599 7,223 7,252
Gross profit 10,423 8,964 19,015 15,255
Capital expenditures 2,627 2,493 5,547 4,012
Lime and Limestone Operations Segment [Member]
       
Business segments        
Revenues 37,320 33,684 72,371 63,839
Depreciation, depletion and amortization 3,447 3,334 6,779 6,714
Gross profit 9,704 8,363 17,366 14,030
Capital expenditures 2,615 2,464 5,531 3,979
Natural Gas Interests Segment [Member]
       
Business segments        
Revenues 1,356 1,488 2,996 2,918
Depreciation, depletion and amortization 220 265 444 538
Gross profit 719 601 1,649 1,225
Capital expenditures $ 12 $ 29 $ 16 $ 33