INVESTMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 1,408,025	$ 1,850,101
Gross Unrealized Holding Gains	105	2
Gross Unrealized Holding Losses	6,219	957
Fair Value	1,401,911	1,849,146
Continuous Unrealized Loss Position less than 12 Months	6,219	957
Short-term \| Commercial paper
Available-for-sale
Amortized Cost	208,909	334,077
Fair Value	208,909	334,077
Short-term \| Certificates of deposit
Available-for-sale
Amortized Cost	34,554	44,502
Fair Value	34,554	44,502
Short-term \| Municipal securities
Available-for-sale
Amortized Cost	212,828	666
Gross Unrealized Holding Gains	78
Gross Unrealized Holding Losses	462
Fair Value	212,444	666
Continuous Unrealized Loss Position less than 12 Months	462
Short-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	74,583	62,687
Gross Unrealized Holding Losses	524	26
Fair Value	74,059	62,661
Continuous Unrealized Loss Position less than 12 Months	524	26
Short-term \| U.S. treasuries
Available-for-sale
Amortized Cost	812,871	1,308,536
Gross Unrealized Holding Gains		2
Gross Unrealized Holding Losses	5,045	717
Fair Value	807,826	1,307,821
Continuous Unrealized Loss Position less than 12 Months	5,045	717
Long-term \| Municipal securities
Available-for-sale
Amortized Cost	1,263
Gross Unrealized Holding Gains	2
Fair Value	1,265
Long-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	6,417	12,500
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	33	24
Fair Value	6,385	12,476
Continuous Unrealized Loss Position less than 12 Months	33	24
Long-term \| U.S. treasuries
Available-for-sale
Amortized Cost	56,600	87,133
Gross Unrealized Holding Gains	24
Gross Unrealized Holding Losses	155	190
Fair Value	56,469	86,943
Continuous Unrealized Loss Position less than 12 Months	$ 155	$ 190

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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Amount, before tax, of unrealized loss 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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Amount of 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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