Fair Value (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value [Abstract]

Financial assets measured at fair value on a recurring basis

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis at December 31, 2011 and 2010, based on the three-tier fair value hierarchy:

	Level 1		Level 2		Level 3		Total
	(In thousands)
December 31, 2011
Assets
Money market funds	$	62,131			$	—	$	62,131
State, municipal and local government agencies bonds				38,825		—		38,825
Corporate bonds				18,604		—		18,604
U.S. federal government bonds		9,230		—		—		9,230
Commercial paper				4,195		—		4,195
Foreign exchange forward contracts				373				373
Total assets measured and recorded at fair value	$	71,361	$	61,997	$	—	$	133,358
Liabilities
Foreign exchange forward contracts	$	—	$	159	$	—	$	159
Total liabilities measured and recorded at fair value	$	—	$	159	$	—	$	159
December 31, 2010
Assets
Money market funds	$	68,081	$	—	$	—	$	68,081
State, municipal and local government agencies bonds		—		11,931		—		11,931
Corporate bonds		—		11,907		—		11,907
Total assets measured and recorded at fair value	$	68,081	$	23,838	$	—	$	91,919

Maturities of short-term investments

At December 31, 2011 and 2010, maturities of short-term investments are as follows:

	December 31,
	2011		2010
	(In thousands)
Short-term investments:
Less than one year	$	43,470	$	21,174
Due in 1 - 2 years		27,384		2,664
Total short-term investments	$	70,854	$	23,838

Summary of available-for-sale securities

The following is a summary of available-for-sale securities at December 31, 2011 and 2010:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
December 31, 2011
State, municipal and local government agencies bonds	$	38,785	$	46	$	(6	)	$	38,825
Corporate bonds		18,613		6		(15	)		18,604
U.S. federal government bonds		9,226		4		—			9,230
Commercial paper		4,195		—		—			4,195
Total	$	70,819	$	56	$	(21	)	$	70,854
December 31, 2010
State, municipal and local government agencies bonds	$	11,915	$	20	$	(4	)	$	11,931
Corporate bonds		11,894		20		(7	)		11,907
Total	$	23,809	$	40	$	(11	)	$	23,838