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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31, 2013 and December 31, 2012:

	As of March 31, 2013
	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	$	139,768			$	139,768			$	—			$	—
Corporate notes, bonds and commercial paper	58,614				—				58,614				—
Total available-for-sale securities	$	198,382			$	139,768			$	58,614			$	—

	As of December 31, 2012
	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	$	126,570			$	126,570			$	—			$	—
Corporate notes, bonds and commercial paper	57,345				—				57,345				—
Total available-for-sale securities	$	183,915			$	126,570			$	57,345			$	—

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 March 31, 2013 and December 31, 2012:

		As of March 31, 2013
(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 three months ended March 31, 2013
Investment in non-marketable securities		$	2,000			$	—			$	—			$	2,000			$	—

		As of December 31, 2012
(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, 2012
Investment in non-marketable securities		$	2,000			$	—			$	—			$	2,000			$	—

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 March 31, 2013 and December 31, 2012:

		As of March 31, 2013												As of December 31, 2012
(in thousands)		Face Value				Carrying Value				Fair Value				Face Value				Carrying Value				Fair Value
5% Convertible Senior Notes due 2014		$	172,500			$	151,487			$	175,519			$	172,500			$	147,556			$	172,716

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 Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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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).

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-Name Accounting Standards Codification

-Topic 820

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