FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

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:

	March 31, 2018
	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	$	762,064	$	—	$	—		$	762,064
Time deposits	—		85,038		—			85,038
Treasury discount notes	149,908		—		—			149,908
Commercial paper	—		217,342		—			217,342
Certificates of deposit	—		4,797		—			4,797
Marketable securities:
Commercial paper	—		4,990		—			4,990
Equity security with a readily determinable fair value	640		—		$	—		640
Total	$	912,612	$	312,167	$	—		$	1,224,779
Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(1,965	)	$	(1,965	)

	December 31, 2017
	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	$	780,425	$	—	$	—		$	780,425
Time deposits	—		60,000		—			60,000
Treasury discount notes	100,457		—		—			100,457
Commercial paper	—		215,325		—			215,325
Certificates of deposit	—		6,195		—			6,195
Marketable securities:
Commercial paper	—		4,995		—			4,995
Total	$	880,882	$	286,515	$	—		$	1,167,397
Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(2,647	)	$	(2,647	)

Schedule of Changes in Assets 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):

	Contingent Consideration Arrangements
	Three Months Ended March 31,
	2018			2017
	(In thousands)
Balance at January 1	$	(2,647	)	$	(33,871	)
Total net losses:
Included in earnings:
Fair value adjustments	(156		)	(1,891		)
Included in other comprehensive loss	(110		)	(1,059		)
Settlements	948			15,000
Balance at March 31	$	(1,965	)	$	(21,821	)

Schedule of Changes in 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):

	Contingent Consideration Arrangements
	Three Months Ended March 31,
	2018			2017
	(In thousands)
Balance at January 1	$	(2,647	)	$	(33,871	)
Total net losses:
Included in earnings:
Fair value adjustments	(156		)	(1,891		)
Included in other comprehensive loss	(110		)	(1,059		)
Settlements	948			15,000
Balance at March 31	$	(1,965	)	$	(21,821	)

Schedule of Carrying Value and the Fair Value of Financial Instruments Measured at Fair Value Only for Disclosure Purposes

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

	March 31, 2018						December 31, 2017
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(14,120	)	$	(14,199	)	$	(13,750	)	$	(13,802	)
Long-term debt, net	(1,980,579		)	(2,211,769		)	(1,979,469		)	(2,168,108		)