CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS PERCENTAGE	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Lime and limestone operations (as a percent)	91.00%	95.60%	91.00%	94.90%
Natural gas interests (as a percent)	9.00%	4.40%	9.00%	5.10%
Total Revenues (as a percent)	100.00%	100.00%	100.00%	100.00%
Cost of revenues:
Labor and other operating expenses (as a percent)	59.10%	62.20%	61.00%	62.70%
Depreciation, depletion and amortization (as a percent)	8.90%	9.90%	9.40%	9.30%
Total Cost of revenues (as a percent)	68.00%	72.20%	70.40%	72.00%
Gross profit (as a percent)	32.00%	27.80%	29.60%	28.00%
Selling, general and administrative expenses (as a percent)	5.90%	5.90%	6.00%	6.00%
Operating profit (as a percent)	26.10%	21.90%	23.60%	22.00%
Other expense (income):
Interest expense (as a percent)	1.50%	2.20%	1.70%	2.00%
Other, net (as a percent)	(0.10%)	0.10%	(0.10%)	(0.10%)
Total Other expense (income) (as a percent)	1.40%	2.10%	1.60%	1.90%
Income before income taxes (as a percent)	24.70%	19.80%	22.00%	20.10%
Income tax expense (as a percent)	6.70%	5.50%	5.80%	5.70%
Net income (as a percent)	18.00%	14.30%	16.20%	14.40%