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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
FAIR VALUE MEASUREMENTS
Short-term investments	$ 547,580	$ 0
Corporate notes and bonds
FAIR VALUE MEASUREMENTS
Short-term investments	362,441
U.S. agency obligations
FAIR VALUE MEASUREMENTS
Short-term investments	103,035
U.S. treasury securities
FAIR VALUE MEASUREMENTS
Short-term investments	51,228
Commercial paper
FAIR VALUE MEASUREMENTS
Short-term investments	22,944
Certificate of deposit
FAIR VALUE MEASUREMENTS
Short-term investments	7,932
Recurring
FAIR VALUE MEASUREMENTS
Contingent consideration	2,400
Total	618,323
Recurring \| Money market funds
FAIR VALUE MEASUREMENTS
Cash Equivalents	5,132
Recurring \| Corporate notes and bonds
FAIR VALUE MEASUREMENTS
Cash Equivalents	16,015
Recurring \| U.S. agency obligations
FAIR VALUE MEASUREMENTS
Cash Equivalents	17,498
Recurring \| Commercial paper
FAIR VALUE MEASUREMENTS
Cash Equivalents	27,296
Recurring \| Level 1
FAIR VALUE MEASUREMENTS
Total	5,132
Recurring \| Level 1 \| Money market funds
FAIR VALUE MEASUREMENTS
Cash Equivalents	5,132
Recurring \| Level 2
FAIR VALUE MEASUREMENTS
Total	610,791
Recurring \| Level 2 \| Corporate notes and bonds
FAIR VALUE MEASUREMENTS
Cash Equivalents	16,015
Recurring \| Level 2 \| U.S. agency obligations
FAIR VALUE MEASUREMENTS
Cash Equivalents	17,498
Recurring \| Level 2 \| Commercial paper
FAIR VALUE MEASUREMENTS
Cash Equivalents	27,296
Recurring \| Level 3
FAIR VALUE MEASUREMENTS
Contingent consideration	2,400
Total	2,400
Recurring \| Corporate notes and bonds
FAIR VALUE MEASUREMENTS
Short-term investments	362,441
Recurring \| Corporate notes and bonds \| Level 2
FAIR VALUE MEASUREMENTS
Short-term investments	362,441
Recurring \| U.S. agency obligations
FAIR VALUE MEASUREMENTS
Short-term investments	103,035
Recurring \| U.S. agency obligations \| Level 2
FAIR VALUE MEASUREMENTS
Short-term investments	103,035
Recurring \| U.S. treasury securities
FAIR VALUE MEASUREMENTS
Short-term investments	51,228
Recurring \| U.S. treasury securities \| Level 2
FAIR VALUE MEASUREMENTS
Short-term investments	51,228
Recurring \| Commercial paper
FAIR VALUE MEASUREMENTS
Short-term investments	22,944
Recurring \| Commercial paper \| Level 2
FAIR VALUE MEASUREMENTS
Short-term investments	22,944
Recurring \| Certificate of deposit
FAIR VALUE MEASUREMENTS
Cash Equivalents	2,402
Short-term investments	7,932
Recurring \| Certificate of deposit \| Level 2
FAIR VALUE MEASUREMENTS
Cash Equivalents	2,402
Short-term investments	$ 7,932