Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 201,477	$ 151,134	$ 502,879	$ 491,914
Cost of sales	138,718	100,984	358,402	314,047
Gross profit	62,759	50,150	144,477	177,867
Selling, general, and administrative, and other operating expenses	18,562	15,135	51,013	48,857
Operating profit	44,197	35,015	93,464	129,010
Other income (expense):
Interest income (expense), net	189	17	616	(18)
Foreign currency exchange gain (loss), net	29	(175)	(2)	(31)
Other, net	(16)	(2)	(87)	(214)
Nonoperating expense, total	202	(160)	527	(263)
Income before income taxes	44,399	34,855	93,991	128,747
Income taxes	14,251	10,957	29,960	42,641
Net income	$ 30,148	$ 23,898	$ 64,031	$ 86,106
Earnings per share:
Basic	$ 1.31	$ 1.04	$ 2.77	$ 3.73
Diluted	$ 1.31	$ 1.04	$ 2.77	$ 3.73
Other information:
Dividends declared per common share (See Note 4)	$ 0.60	$ 0.54	$ 1.14	$ 1.02