FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following tables present the Company's assets and liabilities that are measured at fair value on a recurring basis:

	December 31, 2012
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	545,290	$	—	$	—	$	545,290
Time deposits	—		11,994		—		11,994
Marketable securities:
Corporate debt securities	—		13,627		—		13,627
Equity security	6,977		—		—		6,977
Long-term investments:
Auction rate security	—		—		8,100		8,100
Marketable equity securities	31,244		—		—		31,244
Total	$	583,511	$	25,621	$	8,100	$	617,232

	December 31, 2011
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs  (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Treasury and government agency money market funds	$	321,314	$	—	$	—		$	321,314
Commercial paper	—		237,942		—			237,942
Time deposits	—		4,750		—			4,750
Marketable securities:
Corporate debt securities	—		48,705		—			48,705
States of the U.S. and state political subdivisions	—		112,323		—			112,323
Equity security	4,667		—		—			4,667
Long-term investments:
Auction rate security	—		—		5,870			5,870
Marketable equity securities	74,691		—		—			74,691
Total	$	400,672	$	403,720	$	5,870		$	810,262
Liabilities:
Contingent consideration arrangement	$	—	$	—	$	(10,000	)	$	(10,000	)

Schedule of changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

The following tables present the changes in the Company's assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	For the Year Ended
	December 31, 2012					December 31, 2011
	Auction Rate Security		Contingent Consideration Arrangement			Auction Rate Securities			Contingent Consideration Arrangement
	(In thousands)
Balance at January 1	$	5,870	$	(10,000	)	$	13,100		$	—
Total net gains (losses) (realized and unrealized):
Included in other comprehensive loss	2,230		—			(2,230		)	—
Fair value at date of acquisition	—		—			—			(40,000		)
Settlements	—		10,000			(5,000		)	30,000
Balance at December 31	$	8,100	$	—		$	5,870		$	(10,000	)