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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Assets and liabilities carried at fair value measured on a recurring basis

The following table provides the assets carried at fair value measured on a recurring basis as of March 31, 2013 (in thousands):

					Fair Value Measurements, Using
	Total carrying value as of March 31, 2013				Quoted prices in active markets (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)
Cash equivalents	$	36,063			$	36,063			$	—			$	—
Short-term investments	175,311				175,311				—				—
Long-term investments	4,868				568				—				4,300

The following table provides the assets carried at fair value measured on a recurring basis as of December 31, 2012 (in thousands):

					Fair Value Measurements, Using
	Total carrying  value as of December 31, 2012				Quoted prices in active markets  (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)
Cash equivalents	$	63,863			$	63,863			$	—			$	—
Short-term investments	158,018				154,018				—				4,000
Long-term investments	1,270				970				—				300

Convertible Notes, unobservable input reconciliation

The following table is a reconciliation of the changes in fair value of the Company’s investments in convertible notes for the three months ended March 31, 2013, which had been classified in Level 3 in the fair value hierarchy (in thousands):

Fair value of notes, beginning of period	$	4,300
Investments	—
Fair value of notes, end of period	$	4,300

X

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), 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); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

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