Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements Of Operations
Net sales	$ 250,833	$ 220,713	$ 473,248	$ 395,664
Cost of sales	188,039	159,938	352,334	290,342
Gross profit	62,794	60,775	120,914	105,322
General, selling and administrative expenses	40,664	37,031	80,214	70,818
Operating profit	22,130	23,744	40,700	34,504
Other income (expense):
Interest expense, net	(2,802)	(2,334)	(5,484)	(4,550)
Other, net	489	330	113	(117)
Total other income (expense), net	(2,313)	(2,004)	(5,371)	(4,667)
Income before income taxes and income (loss) from affiliates and joint ventures	19,817	21,740	35,329	29,837
Income tax expense	5,966	5,519	10,331	7,701
Income before income (loss) from affiliates and joint ventures	13,851	16,221	24,998	22,136
Income (loss) from affiliates and joint ventures	(93)	20	996	(71)
Net income (loss)	13,758	16,241	25,994	22,065
Net income (loss) attributable to noncontrolling interests	3	92	4	(212)
Net income (loss) attributable to AMCOL shareholders	$ 13,755	$ 16,149	$ 25,990	$ 22,277
Weighted average common shares outstanding	31,706	31,141	31,611	31,092
Weighted average common and common equivalent shares outstanding	32,206	31,515	32,099	31,467
Basic earnings per share attributable to AMCOL shareholders	$ 0.43	$ 0.52	$ 0.82	$ 0.72
Diluted earnings per share attributable to AMCOL shareholders	$ 0.43	$ 0.51	$ 0.81	$ 0.71
Dividends declared per share	$ 0.18	$ 0.18	$ 0.36	$ 0.36