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FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2017	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair Value Measurements
Payments to Acquire Businesses, Net of Cash Acquired	$ 15,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				$ 10,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount		$ 14,146	$ 14,146
Investments, Contingent Purchase Obligation			900
Level 2
Fair Value Measurements
Cost		256,596	317,722
Gross Unrealized Gains		8	0
Gross Unrealized Losses		(553)	(454)
Fair Value		256,051	317,268
Short-term Investments | Level 2
Fair Value Measurements
Cost		254,994	257,456
Gross Unrealized Gains		8	0
Gross Unrealized Losses		(552)	(235)
Fair Value		254,450	257,221
Short-term Investments | Asset-backed securities | Level 2
Fair Value Measurements
Cost		47,341	28,338
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(152)	(37)
Fair Value		47,189	28,301
Short-term Investments | Commercial paper | Level 2
Fair Value Measurements
Cost		72,447	48,999
Gross Unrealized Gains		8	0
Gross Unrealized Losses		(3)	(23)
Fair Value		72,452	48,976
Short-term Investments | Corporate bonds | Level 2
Fair Value Measurements
Cost		135,206	180,119
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(397)	(175)
Fair Value		134,809	179,944
Long-Term Investments | Level 2
Fair Value Measurements
Cost		1,602	60,266
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(1)	(219)
Fair Value		1,601	60,047
Long-Term Investments | Asset-backed securities | Level 2
Fair Value Measurements
Cost			23,836
Gross Unrealized Gains			0
Gross Unrealized Losses			(79)
Fair Value			23,757
Long-Term Investments | Corporate bonds | Level 2
Fair Value Measurements
Cost		1,602	36,430
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(1)	(140)
Fair Value		$ 1,601	$ 36,290

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