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INVESTMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 1,043,750	$ 925,559
Gross Unrealized Holding Gains	143	165
Gross Unrealized Holding Losses	34	79
Fair Value	1,043,859	925,645
Continuous Unrealized Loss Position less than 12 Months	34	79
Short-term | Commercial paper
Available-for-sale
Amortized Cost	166,306	119,886
Fair Value	166,306	119,886
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	40,517	20,387
Gross Unrealized Holding Gains	3
Fair Value	40,520	20,387
Short-term | Municipal securities
Available-for-sale
Amortized Cost		9,083
Fair Value		9,083
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	87,645	81,521
Gross Unrealized Holding Gains	16	13
Gross Unrealized Holding Losses	3	3
Fair Value	87,658	81,531
Continuous Unrealized Loss Position less than 12 Months	3	3
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	685,521	650,386
Gross Unrealized Holding Gains	123	150
Gross Unrealized Holding Losses	20	69
Fair Value	685,624	650,467
Continuous Unrealized Loss Position less than 12 Months	20	69
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	8,141	10,350
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses	5
Fair Value	8,136	10,351
Continuous Unrealized Loss Position less than 12 Months	5
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	55,620	33,946
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	6	7
Fair Value	55,615	33,940
Continuous Unrealized Loss Position less than 12 Months	$ 6	$ 7

X

- 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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