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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

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

	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			$	—

	As of December 31, 2011
	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	$	127,559			$	127,559			$	—			$	—
Corporate notes, bonds and commercial paper	137,108				—				137,108				—
Total available-for-sale securities	$	264,667			$	127,559			$	137,108			$	—

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

	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 security	$	2,000			$	—			$	—			$	2,000			$	—

	As of December 31, 2011
(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, 2011
Investment in non-marketable security	$	2,000			$	—			$	—			$	2,000			$	—

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

	As of December 31, 2012												As of December 31, 2011
(in thousands)	Face Value				Carrying Value				Fair Value				Face Value				Carrying Value				Fair Value
5% Convertible Senior Notes due 2014	$	172,500			$	147,556			$	172,716			$	172,500			$	133,493			$	170,289

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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-Section 50

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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.

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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.

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