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INVESTMENTS IN DEBT SECURITIES - Short-Term and Long-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,320,232
Fair Value	2,319,916
Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	868,162	$ 692,901
Gross Unrealized Gains	875	2,478
Gross Unrealized Losses	(228)	(267)
Fair Value	868,809	695,112
Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,452,070	461,455
Gross Unrealized Gains	499	2,552
Gross Unrealized Losses	(1,462)	(57)
Fair Value	1,451,107	463,950
U.S. agency securities | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	93,867	153,386
Gross Unrealized Gains	227	782
Gross Unrealized Losses	(6)	(164)
Fair Value	94,088	154,004
U.S. agency securities | Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	152,820	168,762
Gross Unrealized Gains	46	519
Gross Unrealized Losses	(175)	(3)
Fair Value	152,691	169,278
Corporate bonds | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	290,231	76,957
Gross Unrealized Gains	369	256
Gross Unrealized Losses	(77)	(14)
Fair Value	290,523	77,199
Corporate bonds | Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	704,676	174,655
Gross Unrealized Gains	337	1,401
Gross Unrealized Losses	(916)	(42)
Fair Value	704,097	176,014
Commercial paper | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	141,551	4,999
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	141,551	4,999
Municipal securities | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,738	10,377
Gross Unrealized Gains	12	57
Gross Unrealized Losses	0	(3)
Fair Value	15,750	10,431
Municipal securities | Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,952	1,045
Gross Unrealized Gains	23	15
Gross Unrealized Losses	(10)	0
Fair Value	21,965	1,060
Certificates of deposit | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,200
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	8,200
U.S. government securities | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	308,080	404,194
Gross Unrealized Gains	248	1,244
Gross Unrealized Losses	(5)	(4)
Fair Value	308,323	405,434
U.S. government securities | Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	543,483	91,642
Gross Unrealized Gains	34	433
Gross Unrealized Losses	(337)	(2)
Fair Value	543,180	92,073
Foreign government securities | Short-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,495	42,988
Gross Unrealized Gains	19	139
Gross Unrealized Losses	(140)	(82)
Fair Value	10,374	43,045
Foreign government securities | Long-term debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,139	25,351
Gross Unrealized Gains	59	184
Gross Unrealized Losses	(24)	(10)
Fair Value	$ 29,174	$ 25,525

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- Definition

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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