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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

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 December 31, 2015 and 2014:

	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			$	—

	As of December 31, 2014
	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	$	124,938			$	124,938			$	—			$	—
Corporate notes, bonds and commercial paper	145,983				—				145,983				—
Total available-for-sale securities	$	270,921			$	124,938			$	145,983			$	—

Financial instruments that are measured and carried at cost on a nonrecurring basis

The following table presents the financial instruments that are measured and carried at cost on a nonrecurring basis as of December 31, 2014:

	As of December 31, 2014
(in thousands)	Carrying Value				Quoted market prices in active markets (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)				Impairment charges for the year ended December 31, 2014
Investment in non-marketable security	$	—			$	—			$	—			$	—			$	600

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 which require fair value disclosure as of December 31, 2015 and 2014:

As of December 31, 2015

As of December 31, 2014

(in thousands)

Face Value

Carrying Value

Fair Value

Face Value

Carrying Value

Fair Value

1.125% Convertible Senior Notes due 2018

138,000

120,901

156,292

138,000

115,089

159,293

X

- Definition

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258

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The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

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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
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-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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