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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value of Financial Instruments

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

		As of June 30, 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		$	168,847		$	168,847		$	—		$	—
U.S. government bonds and notes		65,592			—			65,592			—
Corporate notes, bonds and commercial paper		113,958			—			113,958			—
Total available-for-sale securities		$	348,397		$	168,847		$	179,550		$	—

		As of December 31, 2010
		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		$	132,364		$	132,364		$	—		$	—
U.S. government bonds and notes		266,817			48,604			218,213			—
Corporate notes, bonds and commercial paper		95,724			—			95,724			—
Total available-for-sale securities		$	494,905		$	180,968		$	313,937		$	—

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

		As of June 30, 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 Three Months Ended June 30, 2010
Investment in non-marketable security		$	2,000		$	—		$	—		$	2,000		$	—

		As of December 31, 2010
(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, 2010
Investment in non-marketable security		$	2,000		$	—		$	—		$	2,000		$	—

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

		As of June 30, 2011									As of December 31, 2010
(in thousands)		Face  Value			Carrying  Value			Fair Value			Face  Value			Carrying  Value			Fair Value
5% Convertible Senior Notes due 2014		$	172,500		$	127,258		$	192,263		$	172,500		$	121,500		$	224,504

X

- Definition

Tabular disclosure of assets and liabilities by class, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). The disclosures that may be required or desired include: (a) the fair value measurements recorded during the period and the reasons for the measurements and (b) 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 or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ 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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Tabular disclosure of the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) 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 or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods. Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258

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-Publisher FASB
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-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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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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