Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2011

The authoritative guidance for fair value measurements defines fair value for accounting purposes, establishes a framework for measuring fair value and provides disclosure requirements regarding fair value measurements. The guidance defines fair value as an exit price, which is the price that would be received upon the sale of an asset or paid upon the transfer of a liability in an orderly transaction between market participants at the measurement date. The degree of judgment utilized in measuring the fair value of assets and liabilities generally correlates to the level of pricing observability. Assets and liabilities with readily available, actively quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and require less judgment in measuring fair value. Conversely, assets and liabilities that are rarely traded or not quoted have less pricing observability and are generally measured at fair value using valuation models that require more judgment. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency of the asset, liability or market and the nature of the asset or liability.

The Company has categorized its assets and liabilities measured at fair value into a three-level hierarchy in accordance with the authoritative guidance for fair value measurements. Assets and liabilities measured at fair value using quoted prices in active markets for identical assets or liabilities are generally categorized as Level 1; assets and liabilities measured at fair value using observable market-based inputs or unobservable inputs that are corroborated by market data for similar assets or liabilities are generally categorized as Level 2; and assets and liabilities measured at fair value using unobservable inputs that cannot be corroborated by market data are generally categorized as Level 3. Assets and liabilities presented at fair value in the Company's condensed consolidated balance sheets are generally categorized as follows:


Level 1:	Quoted prices in active markets for identical assets or liabilities. The Company did not have any Level 1 assets or liabilities as of June 30, 2011 or December 31, 2010.

Level 2:

Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company's Level 2 assets as of June 30, 2011 and December 31, 2010 included its cash equivalents, its short-term investments in obligations of the U.S. government and government agencies and its short-term investments in commercial paper.

Level 3:

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Such assets and liabilities may have values determined using pricing models, discounted cash flow methodologies, or similar techniques, and include instruments for which the determination of fair value requires significant management judgment or estimation. The Company did not have any Level 3 assets or liabilities as of June 30, 2011 or December 31, 2010.

The following tables set forth by level within the fair value hierarchy the Company's assets and liabilities that were recorded at fair value as of June 30, 2011 and December 31, 2010 (in thousands). As required by the guidance for fair value measurements, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Thus, assets and liabilities categorized as Level 3 may be measured at fair value using inputs that are observable (Levels 1 and 2) and unobservable (Level 3). Management's assessment of the significance of a particular input to the fair value measurement requires judgment, which may affect the valuation of assets and liabilities and their placement within the fair value hierarchy levels.



	At Fair Value as of June 30, 2011
	Level 1		Level 2		Level 3		Total

Assets:
Money market funds	$	—	$	231,417	$	—	$	231,417
Commercial paper	—		181,886		—		181,886
U.S. government or government agency securities	—		265,261		—		265,261
Total	$	—	$	678,564	$	—	$	678,564



	At Fair Value as of December 31, 2010
	Level 1		Level 2		Level 3		Total

Assets:
Money market funds	$	—	$	168,831	$	—	$	168,831
Commercial paper	—		17,494		—		17,494
U.S. government or government agency securities	—		108,364		—		108,364
Total	$	—	$	294,689	$	—	$	294,689

Assets in the tables above are reported on the condensed consolidated balance sheets as components of cash and cash equivalents, short-term investments, other current assets and other assets.

Unrealized gains (losses) are presented in accumulated other comprehensive loss within stockholders' equity in the condensed consolidated balance sheets. Realized gains (losses) are presented in other income (expense), net in the condensed consolidated statements of operations.

Cash Equivalents and Short-Term Investments

As of June 30, 2011 and December 31, 2010, all of the Company's short-term investments were debt securities with contractual maturities of less than one year and were classified as available-for-sale. The fair value of the Company's cash equivalents, short-term investments in obligations of the U.S. government and government agencies and a majority of its short-term investments in commercial paper is determined using observable market-based inputs for similar assets, which primarily include yield curves and time-to-maturity factors. Such investments are therefore considered to be Level 2 items.

Available-for-sale securities were comprised as follows as of June 30, 2011 and December 31, 2010 (in thousands):



	As of June 30, 2011
	Cost		Fair Value

Money market funds	$	231,417	$	231,417
Commercial paper	181,884		181,886
U.S. government or government agency securities	265,251		265,261
	$	678,552	$	678,564



	As of December 31, 2010
	Cost		Fair Value

Money market funds	$	168,831	$	168,831
Commercial paper	17,494		17,494
U.S. government or government agency securities	108,364		108,364
	$	294,689	$	294,689

Long-Term Debt

The Company reports its long-term debt obligations at amortized cost; however, for disclosure purposes, the Company is required to measure the fair value of outstanding debt on a recurring basis. The fair value of the Company's outstanding long-term debt is determined primarily by using quoted prices in active markets and was $3,338.5 million and $2,876.8 million as of June 30, 2011 and December 31, 2010, respectively.

Assets Measured at Fair Value on a Nonrecurring Basis

During the period ended June 30, 2011, there were no non-financial assets that were measured and recorded at fair value on a non-recurring basis.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ 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=6925170&loc=d3e19296-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-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.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-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.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-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.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-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.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-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.

+ Details