CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues	$ 148,564	$ 147,657
Cost of sales	104,200	105,273
Gross profit	44,364	42,384
Selling, general, and administrative, and other operating expenses	16,953	16,993
Operating profit	27,411	25,391
Other income:
Interest income, net	171	185
Foreign currency exchange loss, net	(23)	(12)
Other, net	(56)	(61)
Nonoperating expense, total	92	112
Income before income taxes	27,503	25,503
Income taxes	9,076	7,926
Net income	$ 18,427	$ 17,577
Earnings per share:
Basic	$ 0.80	$ 0.76
Diluted	$ 0.80	$ 0.76
Other information:
Dividends declared per common share (See Note 4)	$ 0.60	$ 0.54