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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Level 1
Fair value of certain assets
Cash	$ 139,300	$ 147,113
Assets measured at fair value	199,402	211,087
Level 1 | Money market funds
Fair value of certain assets
Assets measured at fair value	60,102	63,974
Level 2
Fair value of certain assets
Assets measured at fair value	407,802	106,706
Level 2 | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value		24,065
Level 2 | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	22,045	5,603
Level 2 | Commercial paper
Fair value of certain assets
Assets measured at fair value	5,991
Level 2 | Municipal securities
Fair value of certain assets
Assets measured at fair value	379,766	77,038
Level 3
Fair value of certain assets
Assets measured at fair value	17,276	25,085
Level 3 | Auction rate securities
Fair value of certain assets
Assets measured at fair value	16,184	23,156
Level 3 | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	1,092	1,929
Total fair value
Fair value of certain assets
Cash	139,300	147,113
Assets measured at fair value	624,480	342,878
Total fair value | Money market funds
Fair value of certain assets
Assets measured at fair value	60,102	63,974
Total fair value | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value		24,065
Total fair value | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	22,045	5,603
Total fair value | Commercial paper
Fair value of certain assets
Assets measured at fair value	5,991
Total fair value | Municipal securities
Fair value of certain assets
Assets measured at fair value	379,766	77,038
Total fair value | Auction rate securities
Fair value of certain assets
Assets measured at fair value	16,184	23,156
Total fair value | Put option related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 1,092	$ 1,929

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_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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