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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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