CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues	$ 163,166	$ 150,830
Cost of sales	99,702	88,774
Gross profit	63,464	62,056
Selling, general and administrative expenses	16,652	14,287
Start-up costs	62
Loss on disposal or impairment of assets	5	1,679
Operating profit	46,745	46,090
Other income (expense):
Interest (expense) income, net	(44)	44
Foreign currency exchange loss, net	(435)	(188)
Other, net	(259)	(77)
Nonoperating expense, total	(738)	(221)
Income before income taxes	46,007	45,869
Income taxes	15,716	15,705
Net income	$ 30,291	$ 30,164
Earnings per share:
Basic	$ 1.31	$ 1.30
Diluted	$ 1.31	$ 1.30
Other information:
Dividends declared per common share (see Note 4)	$ 0.48	$ 0.40