CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 167,083	$ 118,517	$ 467,582	$ 353,498
Cost of sales	94,390	74,018	270,715	225,193
Gross profit	72,693	44,499	196,867	128,305
Selling, general and administrative expenses	16,622	13,047	46,754	38,732
Start-up costs	127	102	127	621
(Gain) loss on disposal or impairment of assets	(112)	193	1,537	204
Operating profit	56,056	31,157	148,449	88,748
Other income (expense):
Interest income, net	60	57	160	131
Foreign currency exchange gain (loss), net	86	(63)	(228)	(50)
Other, net	11	(92)	(119)	(308)
Nonoperating income (expense), total	157	(98)	(187)	(227)
Income before income taxes	56,213	31,059	148,262	88,521
Income taxes	19,302	10,884	51,243	30,620
Net income	$ 36,911	$ 20,175	$ 97,019	$ 57,901
Earnings per share:
Basic	$ 1.59	$ 0.87	$ 4.19	$ 2.51
Diluted	$ 1.59	$ 0.87	$ 4.19	$ 2.50
Other information:
Dividends declared per common share (See Note 4)	$ 0.48	$ 0.40	$ 0.88	$ 0.76