CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Percentage	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues
Lime and limestone operations (as a percent)	94.10%	91.30%
Natural gas interests (as a percent)	5.90%	8.70%
Total Revenues (as a percent)	100.00%	100.00%
Cost of revenues:
Labor and other operating expenses (as a percent)	64.60%	61.30%
Depreciation, depletion and amortization (as a percent)	9.90%	10.20%
Total Cost of revenues (as a percent)	74.50%	71.50%
Gross profit (as a percent)	25.50%	28.50%
Selling, general and administrative expenses (as a percent)	6.30%	6.60%
Operating profit (as a percent)	19.20%	21.90%
Other expense (income):
Interest expense (as a percent)	1.60%	2.00%
Other, net (as a percent)	0.10%	(0.10%)
Total Other expense (income) (as a percent)	1.70%	1.90%
Income before income taxes (as a percent)	17.50%	20.00%
Income tax expense (as a percent)	4.70%	5.40%
Net income (as a percent)	12.80%	14.60%