CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Comprehensive Income (Loss)	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2010	$ 538,895		$ 14,818	$ 6,460	$ 527,150	$ (9,533)
Beginning Balance (in shares) at Dec. 31, 2010			148,176
Stock issued for stock incentive plans, net (in shares)			1,217
Stock issued for stock incentive plans, net	5,164		121	5,043
Stock purchased and retired (in shares)			(1,099)
Stock purchased and retired	(19,629)		(110)	(14,922)	(4,597)
Net income	138,689	138,689			138,689
Pension adjustment, net of taxes	148	148				148
Change in cash flow hedge, net of taxes	272	272				272
Foreign currency translation, net of taxes	126	126				126
Unrealized loss on securities, net of taxes	(140)	(140)				(140)
Comprehensive income		139,095
Dividends declared	(20,680)				(20,680)
Excess tax benefits for share- based payments	3,419			3,419
Ending Balance at Jun. 30, 2011	$ 646,264		$ 14,829	$ 0	$ 640,562	$ (9,127)
Ending Balance (in shares) at Jun. 30, 2011			148,294