CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2011	$ 22,119		$ 753,119	$ (12,646)	$ 762,592
Balance (in shares) at Dec. 31, 2011	221,188
Stock issued for stock incentive plans, net	80	1,966			2,046
Stock issued for stock incentive plans, net (in shares)	800
Stock purchased and retired	(193)	(4,090)	(25,410)		(29,693)
Stock purchased and retired (in shares)	(1,932)
Net income			80,755		80,755
Pension adjustment, net of taxes				106	106
Foreign currency translation, net of taxes				101	101
Unrealized loss on securities, net of taxes				(5)	(5)
Dividends declared			(17,571)		(17,571)
Excess tax benefits for share-based payments		2,067			2,067
Three-for-two stock split	(57)	57
Three-for-two stock splits (in shares)	(563)
Balance at Mar. 31, 2012	$ 21,949		$ 790,893	$ (12,444)	$ 800,398
Balance (in shares) at Mar. 31, 2012	219,493