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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Put options related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 1,600
Level 1
Fair value of certain assets
Cash	112,725	81,879
Assets measured at fair value	371,223	319,942
Level 1 | Money market funds
Fair value of certain assets
Assets measured at fair value	258,096	230,029
Level 1 | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value	402	8,034
Level 2
Fair value of certain assets
Assets measured at fair value	439,803	438,013
Level 2 | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	42,197	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	346,560	291,984
Level 2 | U.S. government agency securities.
Fair value of certain assets
Assets measured at fair value	19,988	16,005
Level 2 | Variable rate demand notes
Fair value of certain assets
Assets measured at fair value	31,058	58,924
Level 3
Fair value of certain assets
Assets measured at fair value	23,513	38,893
Level 3 | Auction rate securities
Fair value of certain assets
Assets measured at fair value	21,864	35,852
Level 3 | Put options related to auction rate securities
Fair value of certain assets
Assets measured at fair value	1,649	3,041
Total fair value
Fair value of certain assets
Cash	112,725	81,879
Assets measured at fair value	834,539	796,848
Total fair value | Money market funds
Fair value of certain assets
Assets measured at fair value	258,096	230,029
Total fair value | U.S. Treasuries
Fair value of certain assets
Assets measured at fair value	402	8,034
Total fair value | Certificates of deposit
Fair value of certain assets
Assets measured at fair value	42,197	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	346,560	291,984
Total fair value | U.S. government agency securities.
Fair value of certain assets
Assets measured at fair value	19,988	16,005
Total fair value | Variable rate demand notes
Fair value of certain assets
Assets measured at fair value	31,058	58,924
Total fair value | Auction rate securities
Fair value of certain assets
Assets measured at fair value	21,864	35,852
Total fair value | Put options related to auction rate securities
Fair value of certain assets
Assets measured at fair value	$ 1,649	$ 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