Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 151,134	$ 167,083	$ 491,914	$ 467,582
Cost of sales	100,984	94,390	314,047	270,715
Gross profit	50,150	72,693	177,867	196,867
Selling, general and administrative expenses	15,093	16,622	48,801	46,754
Start-up costs		127	68	127
Loss (gain) on disposal or impairment of assets	42	(112)	(12)	1,537
Operating profit	35,015	56,056	129,010	148,449
Other income (expense):
Interest income (expense), net	17	60	(18)	160
Foreign currency exchange (loss) gain, net	(175)	86	(31)	(228)
Other, net	(2)	11	(214)	(119)
Nonoperating income (expense), total	(160)	157	(263)	(187)
Income before income taxes	34,855	56,213	128,747	148,262
Income taxes	10,957	19,302	42,641	51,243
Net income	$ 23,898	$ 36,911	$ 86,106	$ 97,019
Earnings per share:
Basic	$ 1.04	$ 1.59	$ 3.73	$ 4.19
Diluted	$ 1.04	$ 1.59	$ 3.73	$ 4.19
Other information:
Dividends declared per common share (See Note 4)	$ 0.54	$ 0.48	$ 1.02	$ 0.88