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Business Segments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Business Segments        
Number of business segments | segment     2  
Business segments        
Revenues $ 32,450 $ 38,676 $ 62,514 $ 75,367
Depreciation, depletion and amortization 3,885 3,667 7,769 7,223
Gross profit 7,013 10,423 12,877 19,015
Capital expenditures 2,886 2,627 6,310 5,547
Lime and limestone operations        
Business segments        
Revenues 31,779 37,320 61,141 72,371
Depreciation, depletion and amortization 3,697 3,447 7,389 6,779
Gross profit 6,809 9,704 12,506 17,366
Capital expenditures 2,883 2,615 6,303 5,531
Natural gas interests        
Business segments        
Revenues 671 1,356 1,373 2,996
Depreciation, depletion and amortization 188 220 380 444
Gross profit 204 719 371 1,649
Capital expenditures $ 3 $ 12 $ 7 $ 16