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INVESTMENTS - HTM & AFS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Held to Maturity and Available-for-sale |  |
Held to maturity and available-for-sale securities, Amortized Cost | $ 759,958 | $ 820,164
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains | 63 | 115
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses | 296 | 3
Held to maturity and available-for-sale securities, Fair Value | 759,725 | 820,276
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months | 296 |
Held to Maturity, Available-for-sale, and Trading |  |
Investments, Fair Value Disclosure | 759,725 | 824,186
Short-term | Commercial paper |  |
Held-to-Maturity |  |
Amortized Cost | 3,978 | 19,482
Gross Unrealized Holding Losses |  | 2
Fair Value | 3,978 | 19,480
Short-term | Municipal securities |  |
Held-to-Maturity |  |
Amortized Cost | 709,207 | 744,542
Gross Unrealized Holding Gains | 63 | 105
Gross Unrealized Holding Losses | 192 |
Fair Value | 709,078 | 744,647
Continuous Unrealized Loss Position less than 12 Months | 192 |
Short-term | U.S. government agency securities |  |
Held-to-Maturity |  |
Amortized Cost | 23,369 | 9,199
Gross Unrealized Holding Losses | 58 | 1
Fair Value | 23,311 | 9,198
Continuous Unrealized Loss Position less than 12 Months | 58 |
Short-term | Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost |  | 4,001
Fair Value |  | 4,001
Short-term | Auction rate securities |  |
Trading |  |
Fair Value |  | 3,910
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 | 11,071 | 42,940
Gross Unrealized Holding Gains |  | 10
Gross Unrealized Holding Losses | 8 |
Fair Value | 11,063 | $ 42,950
Continuous Unrealized Loss Position less than 12 Months | 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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