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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Level 1
Fair value of certain assets
Cash	$ 165,754	$ 81,879
Assets measured at fair value	282,438	319,942
Level 1 | Money market funds
Fair value of certain assets
Assets measured at fair value	116,684	230,029
Level 1 | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value		8,034
Level 2
Fair value of certain assets
Assets measured at fair value	307,397	438,013
Level 2 | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	17,015	69,078
Level 2 | Corporate bonds
Fair value of certain assets
Assets measured at fair value		2,022
Level 2 | Municipal securities
Fair value of certain assets
Assets measured at fair value	253,899	291,984
Level 2 | U.S. government agency securities.
Fair value of certain assets
Assets measured at fair value	29,982	16,005
Level 2 | Variable rate demand notes
Fair value of certain assets
Assets measured at fair value	6,501	58,924
Level 3
Fair value of certain assets
Assets measured at fair value	22,686	38,893
Level 3 | Auction rate securities
Fair value of certain assets
Assets measured at fair value	20,755	35,852
Level 3 | Put options related to auction rate securities
Fair value of certain assets
Assets measured at fair value	1,931	3,041
Total fair value
Fair value of certain assets
Cash	165,754	81,879
Assets measured at fair value	612,521	796,848
Total fair value | Money market funds
Fair value of certain assets
Assets measured at fair value	116,684	230,029
Total fair value | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value		8,034
Total fair value | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	17,015	69,078
Total fair value | Corporate bonds
Fair value of certain assets
Assets measured at fair value		2,022
Total fair value | Municipal securities
Fair value of certain assets
Assets measured at fair value	253,899	291,984
Total fair value | U.S. government agency securities.
Fair value of certain assets
Assets measured at fair value	29,982	16,005
Total fair value | Variable rate demand notes
Fair value of certain assets
Assets measured at fair value	6,501	58,924
Total fair value | Auction rate securities
Fair value of certain assets
Assets measured at fair value	20,755	35,852
Total fair value | Put options related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 1,931	$ 3,041

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value 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.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unrestricted cash available for day-to-day operating needs, for an entity that has cash equivalents, but does not aggregate cash equivalents with cash on the balance sheet.

+ References

Reference 1: 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



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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7

-Footnote 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

+ Details

Name:	us-gaap_Cash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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