CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues	$ 625,705	$ 473,082	$ 341,872
Cost of sales	363,990	298,411	221,369
Gross profit	261,715	174,671	120,503
Selling, general and administrative expenses	62,381	52,635	40,897
Start-up costs	184	977
Loss on disposal or impairment of assets	1,548	1,449	156
Operating profit	197,602	119,610	79,450
Other income (expense):
Interest income, net	197	178	451
Foreign currency exchange loss, net	(135)	(96)	(192)
Other, net	(214)	(343)	85
Nonoperating income (expense), total	(152)	(261)	344
Income before income taxes	197,450	119,349	79,794
Income taxes	67,314	40,633	26,984
Net income	$ 130,136	$ 78,716	$ 52,810
Earnings per share:
Basic	$ 5.62	$ 3.41	$ 2.27
Diluted	$ 5.62	$ 3.40	$ 2.27