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FINANCIAL INSTRUMENTS - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Measurements
Cost	$ 559,723	$ 516,845
Gross Unrealized Gains	109	350
Gross Unrealized Losses	(10)	(31)
Fair Value (Level 2)	559,822	517,164
Short-term:
Fair Value Measurements
Cost		421,416
Gross Unrealized Gains		320
Gross Unrealized Losses		(31)
Fair Value (Level 2)		421,705
Long-term:
Fair Value Measurements
Cost		95,429
Gross Unrealized Gains		30
Gross Unrealized Losses		0
Fair Value (Level 2)		95,459
Asset-backed securities | Short-term:
Fair Value Measurements
Cost	17,615	34,918
Gross Unrealized Gains	3	98
Gross Unrealized Losses	(2)	0
Fair Value (Level 2)	17,616	35,016
Commercial paper | Short-term:
Fair Value Measurements
Cost	423,302	221,494
Gross Unrealized Gains	82	36
Gross Unrealized Losses	0	(18)
Fair Value (Level 2)	423,384	221,512
Corporate bonds | Short-term:
Fair Value Measurements
Cost	32,612	120,375
Gross Unrealized Gains	0	179
Gross Unrealized Losses	(7)	(11)
Fair Value (Level 2)	32,605	120,543
U.S. Government bonds | Short-term:
Fair Value Measurements
Cost	86,194	44,629
Gross Unrealized Gains	24	7
Gross Unrealized Losses	(1)	(2)
Fair Value (Level 2)	$ 86,217	44,634
U.S. Government bonds | Long-term:
Fair Value Measurements
Cost		95,429
Gross Unrealized Gains		30
Gross Unrealized Losses		0
Fair Value (Level 2)		$ 95,459

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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