CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Percentage	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Lime and limestone operations (as a percent)	95.50%	95.50%
Natural gas interests (as a percent)	4.50%	4.50%
Total revenues (as a percent)	100.00%	100.00%
Cost of revenues:
Labor and other operating expenses (as a percent)	66.90%	68.50%
Depreciation, depletion and amortization (as a percent)	9.70%	11.60%
Total cost of revenues (as a percent)	76.60%	80.10%
Gross profit (as a percent)	23.40%	19.90%
Selling, general and administrative expenses (as a percent)	6.00%	6.80%
Operating profit (as a percent)	17.40%	13.10%
Other expense (income):
Interest expense (as a percent)	1.10%	1.50%
Other, net (as a percent)	0.00%	(0.10%)
Total other expense (income) (as a percent)	1.10%	1.40%
Income before income taxes (as a percent)	16.30%	11.70%
Income tax expense (as a percent)	4.10%	3.00%
Net income (as a percent)	12.20%	8.70%