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INVESTMENTS - HTM & AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale
Amortized Cost	$ 209,904	$ 223,144
Gross Unrealized Holding Gains	2
Gross Unrealized Holding Losses	63	196
Fair Value	209,843	222,948
Continuous Unrealized Loss Position less than 12 Months	61	196
Short-term | Commercial paper
Available-for-sale
Amortized Cost	50,623	40,382
Fair Value	50,623	40,382
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	3,164
Fair Value	3,164
Short-term | Municipal securities
Available-for-sale
Amortized Cost	119,833	140,379
Gross Unrealized Holding Gains	2
Gross Unrealized Holding Losses	56	181
Fair Value	119,779	140,198
Continuous Unrealized Loss Position less than 12 Months	54	181
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	10,076	26,057
Gross Unrealized Holding Losses	6	6
Fair Value	10,070	26,051
Continuous Unrealized Loss Position less than 12 Months	6	6
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	25,730	13,923
Fair Value	25,730	13,923
Long-term | Municipal securities
Available-for-sale
Amortized Cost	478	2,403
Gross Unrealized Holding Losses	1	9
Fair Value	477	2,394
Continuous Unrealized Loss Position less than 12 Months	$ 1	$ 9

X

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

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