FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

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

The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:

	December 31, 2014
	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	$	174,720	$	—	$	—		$	174,720
Commercial paper	—		388,801		—			388,801
Time deposits	—		42,914		—			42,914
Marketable securities:
Corporate debt securities	—		159,197		—			159,197
Equity security	1,451		—		—			1,451
Long-term investments:
Auction rate security	—		—		6,070			6,070
Marketable equity security	7,410		—		—			7,410
Total	$	183,581	$	590,912	$	6,070		$	780,563
Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(30,140	)	$	(30,140	)

	December 31, 2013
	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	$	698,307	$	—	$	—		$	698,307
Commercial paper	—		12,000		—			12,000
Time deposits	—		32,325		—			32,325
Marketable securities:
Corporate debt security	—		1,008		—			1,008
Equity securities	4,996		—		—			4,996
Long-term investments:
Auction rate security	—		—		8,920			8,920
Marketable equity securities	11,711		—		—			11,711
Total	$	715,014	$	45,333	$	8,920		$	769,267
Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(45,828	)	$	(45,828	)

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

The following table presents the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	For the Year Ended
	December 31, 2014						December 31, 2013
	Auction Rate Security			Contingent Consideration Arrangements			Auction Rate Security		Contingent Consideration Arrangements
	(In thousands)
Balance at January 1	$	8,920		$	(45,828	)	$	8,100	$	(1,909	)
Total net gains (losses):
Included in earnings	—			13,367			—		(343		)
Included in other comprehensive (loss) income	(2,850		)	3,025			820		(2,445		)
Fair value at date of acquisition	—			(8,813		)	—		(41,387		)
Settlements	—			8,109			—		256
Balance at December 31	$	6,070		$	(30,140	)	$	8,920	$	(45,828	)

Fair Value, by Balance Sheet Grouping

The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:

	December 31, 2014						December 31, 2013
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Long-term debt	$	(1,080,000	)	$	(1,099,813	)	$	(1,080,000	)	$	(1,058,396	)