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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Level 1
Fair value of certain assets
Cash	$ 216,147	$ 139,300
Assets measured at fair value	366,680	199,402
Level 1 | Money market funds
Fair value of certain assets
Assets measured at fair value	150,533	60,102
Level 2
Fair value of certain assets
Assets measured at fair value	653,293	407,802
Level 2 | Foreign currency exchange contracts
Fair value of certain assets
Foreign currency derivatives	32
Level 2 | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	2,504	22,045
Level 2 | Commercial paper
Fair value of certain assets
Assets measured at fair value	1,000	5,991
Level 2 | Municipal securities
Fair value of certain assets
Assets measured at fair value	649,757	379,766
Level 3
Fair value of certain assets
Assets measured at fair value	5,162	17,276
Level 3 | Auction rate securities
Fair value of certain assets
Assets measured at fair value	4,842	16,184
Level 3 | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	320	1,092
Total fair value
Fair value of certain assets
Cash	216,147	139,300
Assets measured at fair value	1,025,135	624,480
Total fair value | Foreign currency exchange contracts
Fair value of certain assets
Foreign currency derivatives	32
Total fair value | Money market funds
Fair value of certain assets
Assets measured at fair value	150,533	60,102
Total fair value | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	2,504	22,045
Total fair value | Commercial paper
Fair value of certain assets
Assets measured at fair value	1,000	5,991
Total fair value | Municipal securities
Fair value of certain assets
Assets measured at fair value	649,757	379,766
Total fair value | Auction rate securities
Fair value of certain assets
Assets measured at fair value	4,842	16,184
Total fair value | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 320	$ 1,092

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

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