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INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale
Amortized Cost	$ 637,472	$ 223,144
Gross Unrealized Holding Gains	42
Gross Unrealized Holding Losses	163	196
Fair Value	637,351	222,948
Continuous Unrealized Loss Position less than 12 Months	163	196
Short-term | Commercial paper
Available-for-sale
Amortized Cost	66,344	40,382
Fair Value	66,344	40,382
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	50,677
Fair Value	50,677
Short-term | Municipal securities
Available-for-sale
Amortized Cost	402,062	140,379
Gross Unrealized Holding Gains	41
Gross Unrealized Holding Losses	126	181
Fair Value	401,977	140,198
Continuous Unrealized Loss Position less than 12 Months	126	181
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	53,342	26,057
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	28	6
Fair Value	53,315	26,051
Continuous Unrealized Loss Position less than 12 Months	28	6
Short-term | U.S. Treasuries
Available-for-sale
Amortized Cost	11,982
Gross Unrealized Holding Losses	1
Fair Value	11,981
Continuous Unrealized Loss Position less than 12 Months	1
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	46,054	13,923
Fair Value	46,054	13,923
Long-term | Municipal securities
Available-for-sale
Amortized Cost	2,010	2,403
Gross Unrealized Holding Losses	3	9
Fair Value	2,007	2,394
Continuous Unrealized Loss Position less than 12 Months	3	$ 9
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	5,001
Gross Unrealized Holding Losses	5
Fair Value	4,996
Continuous Unrealized Loss Position less than 12 Months	$ 5

X

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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