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INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale
Amortized Cost	$ 545,771
Gross Unrealized Holding Gains	285
Gross Unrealized Holding Losses	88
Fair Value	545,968
Continuous Unrealized Loss Position less than 12 Months	88
Short-term
Available-for-sale
Amortized Cost		$ 320,740
Gross Unrealized Holding Gains		16
Gross Unrealized Holding Losses		106
Fair Value		320,650
Continuous Unrealized Loss Position less than 12 Months		106
Short-term | Commercial paper
Available-for-sale
Amortized Cost	83,478	52,838
Fair Value	83,478	52,838
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	28,049	14,075
Fair Value	28,049	14,075
Short-term | Municipal securities
Available-for-sale
Amortized Cost	147,983	151,690
Gross Unrealized Holding Gains	145	16
Gross Unrealized Holding Losses	20	62
Fair Value	148,108	151,644
Continuous Unrealized Loss Position less than 12 Months	20	62
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	40,620	19,943
Gross Unrealized Holding Gains	5
Gross Unrealized Holding Losses	35	12
Fair Value	40,590	19,931
Continuous Unrealized Loss Position less than 12 Months	35	12
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	211,055	78,189
Gross Unrealized Holding Gains	134
Gross Unrealized Holding Losses	31	32
Fair Value	211,158	78,157
Continuous Unrealized Loss Position less than 12 Months	31	32
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	21,680	4,005
Fair Value	21,680	$ 4,005
Long-term | Municipal securities
Available-for-sale
Amortized Cost	1,562
Gross Unrealized Holding Losses	1
Fair Value	1,561
Continuous Unrealized Loss Position less than 12 Months	1
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	5,267
Gross Unrealized Holding Losses	1
Fair Value	5,266
Continuous Unrealized Loss Position less than 12 Months	1
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	6,077
Gross Unrealized Holding Gains	1
Fair Value	$ 6,078

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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