Fair Value Measurements (Tables)

As of June 30, 2013 and December 31, 2012, our assets carried at fair value on a recurring basis were as follows:



	Level 1		Level 2		Level 3		Total Fair Value
June 30, 2013	(In thousands)
Corporate bonds	$	—	$	38,965	$	—	$	38,965
Commercial paper	—		58,970		—		58,970
Negotiable certificate of deposit	—		4,409		—		4,409
U.S. Treasury notes	—		2,304		—		2,304
Agency securities	—		26,504		—		26,504
Mortgage-backed securities	—		1,147		—		1,147
Municipal bonds	—		19,590		—		19,590
Asset-backed securities	—		20,578		—		20,578
Total	$	—	$	172,467	$	—	$	172,467

December 31, 2012
Corporate bonds	$	—	$	37,357	$	—	$	37,357
Commercial paper	—		55,748		—		55,748
Negotiable certificate of deposit	—		4,414		—		4,414
U.S. treasury notes	—		22,267		—		22,267
Agency securities	—		25,867		—		25,867
Municipal bonds	—		11,568		—		11,568
Asset-backed securities	—		26,566		—		26,566
Total	$	—	$	183,787	$	—	$	183,787

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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