FAIR VALUE MEASUREMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Short-term investments:
Short-term investments	$ 339,536	$ 445,315
Corporate notes and bonds
Short-term investments:
Short-term investments	291,105	348,689
U.S. agency obligations
Short-term investments:
Short-term investments	27,807	34,808
U.S. treasury securities
Short-term investments:
Short-term investments	20,624	53,587
Commercial paper
Short-term investments:
Short-term investments		6,309
Certificates of deposit
Short-term investments:
Short-term investments		1,922
Recurring
Total
Total	387,343	476,823
Recurring \| Money market funds
Cash Equivalents:
Cash equivalents	61,707	44,108
Recurring \| Level 1
Total
Total	61,707	44,108
Recurring \| Level 1 \| Money market funds
Cash Equivalents:
Cash equivalents	61,707	44,108
Recurring \| Level 2
Total
Total	339,536	445,315
Recurring \| Level 3
Total
Total	(13,900)	(12,600)
Recurring \| Contingent consideration
Liabilities / Other Current Liabilities:
Contingent consideration	(13,900)	(12,600)
Recurring \| Contingent consideration \| Level 3
Liabilities / Other Current Liabilities:
Contingent consideration	(13,900)	(12,600)
Recurring \| Corporate notes and bonds
Short-term investments:
Short-term investments	291,104	348,689
Recurring \| Corporate notes and bonds \| Level 2
Short-term investments:
Short-term investments	291,104	348,689
Recurring \| U.S. agency obligations
Short-term investments:
Short-term investments	27,808	34,808
Recurring \| U.S. agency obligations \| Level 2
Short-term investments:
Short-term investments	27,808	34,808
Recurring \| U.S. treasury securities
Short-term investments:
Short-term investments	20,624	53,587
Recurring \| U.S. treasury securities \| Level 2
Short-term investments:
Short-term investments	20,624	53,587
Recurring \| Commercial paper
Short-term investments:
Short-term investments		6,309
Recurring \| Commercial paper \| Level 2
Short-term investments:
Short-term investments		6,309
Recurring \| Certificates of deposit
Short-term investments:
Short-term investments	0	1,922
Recurring \| Certificates of deposit \| Level 2
Short-term investments:
Short-term investments	$ 0	$ 1,922

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value of asset after deduction of liability.

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