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INVESTMENTS - HTM & AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Held-to-Maturity
Amortized Cost	$ 267,172
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	244
Fair Value	266,929
Continuous Unrealized Loss Position less than 12 Months	244
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost		$ 759,958
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains		63
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses		296
Held to maturity and available-for-sale securities, Fair Value		759,725
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months		296
Short-term | Commercial paper
Held-to-Maturity
Amortized Cost	28,318	3,978
Fair Value	28,318	3,978
Short-term | Municipal securities
Held-to-Maturity
Amortized Cost	181,843	709,207
Gross Unrealized Holding Gains		63
Gross Unrealized Holding Losses	222	192
Fair Value	181,621	709,078
Continuous Unrealized Loss Position less than 12 Months	222	192
Short-term | U.S. government agency securities
Held-to-Maturity
Amortized Cost	26,080	23,369
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	3	58
Fair Value	26,078	23,311
Continuous Unrealized Loss Position less than 12 Months	3	58
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	21,412
Fair Value	21,412
Short-term | U.S. Treasuries
Held-to-Maturity
Amortized Cost		8,056
Gross Unrealized Holding Losses		13
Fair Value		8,043
Continuous Unrealized Loss Position less than 12 Months		13
Long-term | Municipal securities
Held-to-Maturity
Amortized Cost	9,519	11,071
Gross Unrealized Holding Losses	19	8
Fair Value	9,500	11,063
Continuous Unrealized Loss Position less than 12 Months	$ 19	8
Long-term | U.S. government agency securities
Held-to-Maturity
Amortized Cost		4,277
Gross Unrealized Holding Losses		25
Fair Value		4,252
Continuous Unrealized Loss Position less than 12 Months		$ 25

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