INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 1,427,954	$ 1,850,101
Gross Unrealized Holding Gains	5	2
Gross Unrealized Holding Losses	8,805	957
Fair Value	1,419,154	1,849,146
Continuous Unrealized Loss Position less than 12 Months	8,805	957
Short-term \| Commercial paper
Available-for-sale
Amortized Cost	218,573	334,077
Gross Unrealized Holding Losses	7
Fair Value	218,566	334,077
Continuous Unrealized Loss Position less than 12 Months	7
Short-term \| Certificates of deposit
Available-for-sale
Amortized Cost	20,035	44,502
Fair Value	20,035	44,502
Short-term \| Municipal securities
Available-for-sale
Amortized Cost	193,567	666
Gross Unrealized Holding Gains	4
Gross Unrealized Holding Losses	1,142
Fair Value	192,429	666
Continuous Unrealized Loss Position less than 12 Months	1,142
Short-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	88,573	62,687
Gross Unrealized Holding Losses	851	26
Fair Value	87,722	62,661
Continuous Unrealized Loss Position less than 12 Months	851	26
Short-term \| U.S. treasuries
Available-for-sale
Amortized Cost	834,249	1,308,536
Gross Unrealized Holding Gains		2
Gross Unrealized Holding Losses	6,220	717
Fair Value	828,029	1,307,821
Continuous Unrealized Loss Position less than 12 Months	6,220	717
Long-term \| Municipal securities
Available-for-sale
Amortized Cost	5,562
Gross Unrealized Holding Losses	35
Fair Value	5,527
Continuous Unrealized Loss Position less than 12 Months	35
Long-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	11,711	12,500
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	74	24
Fair Value	11,638	12,476
Continuous Unrealized Loss Position less than 12 Months	74	24
Long-term \| U.S. treasuries
Available-for-sale
Amortized Cost	55,684	87,133
Gross Unrealized Holding Losses	476	190
Fair Value	55,208	86,943
Continuous Unrealized Loss Position less than 12 Months	$ 476	$ 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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