Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2011

Stockholders' Equity [Abstract]

Summary of the changes in stockholders' equity

	Stockholders’
(In thousands)	Equity
Balance, December 31, 2010	$	572,322
Net income		71,201
Dividend payments		(11,596	)
Dividends accrued for unvested restricted stock units		(19	)
Net change in unrealized gains and losses on marketable securities (net of deferred taxes)		(5,791	)
Reclassification adjustment for amounts included in net income (net of deferred taxes)		(395	)
Foreign currency translation adjustment		456
Proceeds from stock option exercises		33,022
Tax benefits from stock option exercises		10,318
Stock-based compensation expense		4,165
Balance, June 30, 2011	$	673,683

Cash dividends

Record Date	Payment Date	Per Share Amount		Total Dividend Paid
February 3, 2011	February 17, 2011	$	0.09	$	5,775
April 28, 2011	May 12, 2011	$	0.09	$	5,821

Comprehensive Income

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(In thousands)	2011			2010			2011			2010
Net income	$	36,943		$	27,751		$	71,201		$	45,945
Net change in unrealized gains and losses related to marketable securities, net of deferred tax benefit of $2,029 and $3,404 for the three months ended June 30, 2011 and 2010, respectively, and $2,702 and $631 for the six months ended June 30, 2011 and 2010, respectively		(3,140	)		(5,678	)		(5,791	)		(1,056	)
Reclassification adjustment for amounts included in net income, net of deferred tax benefit of $146 and $96 for the three months ended June 30, 2011 and 2010, respectively, and $186 and $127 for the six months ended June 30, 2011 and 2010, respectively		(236	)		(160	)		(395	)		(212	)
Foreign currency translation adjustment		369			(770	)		456			(602	)
Total comprehensive income	$	33,936		$	21,143		$	65,471		$	44,075