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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Summary of the valuation of cash equivalents and marketable securities by pricing levels

The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of June 30, 2016 and December 31, 2015:

	As of June 30, 2016
	Total				Quoted Market Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	(In thousands)
Money market funds	$	128,034			$	128,034			$	—			$	—
U.S. Government bonds and notes	7,002				—				7,002				—
Corporate notes, bonds, commercial paper and other	74,309				538				73,771				—
Total available-for-sale securities	$	209,345			$	128,572			$	80,773			$	—

	As of December 31, 2015
	Total				Quoted Market Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	(In thousands)
Money market funds	$	77,804			$	77,804			$	—			$	—
U.S. Government bonds and notes	14,110				—				14,110				—
Corporate notes, bonds, commercial paper and other	160,823				1,264				159,559				—
Total available-for-sale securities	$	252,737			$	79,068			$	173,669			$	—

Financial instruments not carried at fair value but requiring fair value disclosure

The following table presents the financial instruments that are not carried at fair value but require fair value disclosure as of June 30, 2016 and December 31, 2015:

		As of June 30, 2016												As of December 31, 2015
(In thousands)		Face Value				Carrying Value				Fair Value				Face Value				Carrying Value				Fair Value
1.125% Convertible Senior Notes due 2018 (the "2018 Notes")		$	138,000			$	122,744			$	160,731			$	138,000			$	119,418			$	156,292

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- References

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- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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