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INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale
Amortized Cost	$ 601,447	$ 320,740
Gross Unrealized Holding Gains	344	16
Gross Unrealized Holding Losses	65	106
Fair Value	601,726	320,650
Continuous Unrealized Loss Position less than 12 Months	65	106
Short-term | Commercial paper
Available-for-sale
Amortized Cost	81,869	52,838
Fair Value	81,869	52,838
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	2,502	14,075
Fair Value	2,502	14,075
Short-term | Municipal securities
Available-for-sale
Amortized Cost	138,072	151,690
Gross Unrealized Holding Gains	151	16
Gross Unrealized Holding Losses	9	62
Fair Value	138,214	151,644
Continuous Unrealized Loss Position less than 12 Months	9	62
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	41,186	19,943
Gross Unrealized Holding Gains	7
Gross Unrealized Holding Losses	37	12
Fair Value	41,156	19,931
Continuous Unrealized Loss Position less than 12 Months	37	12
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	294,099	78,189
Gross Unrealized Holding Gains	179
Gross Unrealized Holding Losses	10	32
Fair Value	294,268	78,157
Continuous Unrealized Loss Position less than 12 Months	10	32
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	29,347	4,005
Fair Value	29,347	$ 4,005
Long-term | Municipal securities
Available-for-sale
Amortized Cost	3,198
Gross Unrealized Holding Losses	5
Fair Value	3,193
Continuous Unrealized Loss Position less than 12 Months	5
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	11,174
Gross Unrealized Holding Gains	7
Gross Unrealized Holding Losses	4
Fair Value	11,177
Continuous Unrealized Loss Position less than 12 Months	$ 4

X

- Definition

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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