CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 46,374	$ 36,223
Trade receivables, net	18,742	13,839
Inventories	9,503	10,600
Prepaid expenses and other current assets	1,109	1,225
Total current assets	75,728	61,887
Property, plant and equipment, at cost	234,421	229,199
Less accumulated depreciation and depletion	(112,036)	(102,962)
Property, plant and equipment, net	122,385	126,237
Other assets, net	316	374
Total assets	198,429	188,498
Current liabilities:
Current installments of debt	5,000	5,000
Accounts payable	5,772	4,545
Accrued expenses	4,706	6,166
Total current liabilities	15,478	15,711
Debt, excluding current installments	27,917	31,666
Deferred tax liabilities, net	12,455	8,933
Other liabilities	4,304	3,894
Total liabilities	60,154	60,204
Stockholders' equity:
Common stock	643	642
Additional paid-in capital	16,976	16,354
Accumulated other comprehensive loss	(3,066)	(3,009)
Retained earnings	132,395	114,724
Less treasury stock, at cost	(8,673)	(417)
Total stockholders' equity	138,275	128,294
Total liabilities and stockholders' equity	$ 198,429	$ 188,498