FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Current Available-for-sale Marketable Debt Securities

At December 31, 2018, current available-for-sale marketable debt securities are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Treasury discount notes	$	24,947	$	1	$	(1	)	$	24,947
Total available-for-sale marketable debt securities	$	24,947	$	1	$	(1	)	$	24,947

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, 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	$	137,359	$	—	$	—	$	137,359
Treasury discount notes	—		99,914		—		99,914
Commercial paper	—		52,931		—		52,931
Time deposits	—		15,000		—		15,000
Marketable debt securities:
Treasury discount notes	—		24,947		—		24,947
Total	$	137,359	$	192,792	$	—	$	330,151

	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	$	189,207	$	—	$	—	$	189,207
Treasury discount notes	—		500		—		500
Certificate of deposit	—		6,195		—		6,195
Total	$	189,207	$	6,695	$	—	$	195,902

Schedule of Carrying Value and Fair Value of Financial Instruments

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

	December 31, 2018						December 31, 2017
	Carrying value			Fair value			Carrying value			Fair value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(12,753	)	$	(13,750	)	$	(13,802	)
Long-term debt, net (a)	(244,971		)	(229,556		)	(258,312		)	(262,230		)
Current portion of long-term debt—related party	—			—			(816		)	(837		)
Long-term debt—related party, net	(1,015		)	(1,092		)	(1,997		)	(2,048		)

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^(a)  At December 31, 2018 and 2017, the carrying value of long-term debt, net includes unamortized debt issuance costs of $2.5 million and $2.9 million, respectively.