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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Level 1
Fair value of certain assets
Cash	$ 207,079	$ 139,300
Assets measured at fair value	280,093	199,402
Level 1 | Money market funds
Fair value of certain assets
Assets measured at fair value	73,014	60,102
Level 2
Fair value of certain assets
Foreign currency derivatives	(21)
Assets measured at fair value	464,443	407,802
Level 2 | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	22,043	22,045
Level 2 | Commercial paper
Fair value of certain assets
Assets measured at fair value	9,990	5,991
Level 2 | Municipal securities
Fair value of certain assets
Assets measured at fair value	432,431	379,766
Level 3
Fair value of certain assets
Assets measured at fair value	15,550	17,276
Level 3 | Auction rate securities
Fair value of certain assets
Assets measured at fair value	14,526	16,184
Level 3 | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	1,024	1,092
Total fair value
Fair value of certain assets
Cash	207,079	139,300
Foreign currency derivatives	(21)
Assets measured at fair value	760,086	624,480
Total fair value | Money market funds
Fair value of certain assets
Assets measured at fair value	73,014	60,102
Total fair value | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	22,043	22,045
Total fair value | Commercial paper
Fair value of certain assets
Assets measured at fair value	9,990	5,991
Total fair value | Municipal securities
Fair value of certain assets
Assets measured at fair value	432,431	379,766
Total fair value | Auction rate securities
Fair value of certain assets
Assets measured at fair value	14,526	16,184
Total fair value | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 1,024	$ 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=25499696&loc=d3e19207-110258

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Balance Type:	debit
Period Type:	instant

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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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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Balance Type:	credit
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