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INVESTMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Held to Maturity and Available-for-sale |  |
Held to maturity and available-for-sale securities, Amortized Cost | $ 1,577,578 | $ 820,164
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains | 363 | 115
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses | 21 | 3
Held to maturity and available-for-sale securities, Fair Value | 1,577,920 | 820,276
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months | 21 |
Held to Maturity, Available-for-sale, and Trading |  |
Investments, Fair Value Disclosure | 1,579,407 | 824,186
U.S. government agency securities |  |
Held to Maturity, Available-for-sale, and Trading |  |
Investments, Fair Value Disclosure | 5,019 |
Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost |  | 4,001
Fair Value |  | 4,001
Short-term | Commercial paper |  |
Held-to-Maturity |  |
Amortized Cost | 306,858 | 19,482
Gross Unrealized Holding Losses |  | 2
Fair Value | 306,858 | 19,480
Short-term | U.S. Treasuries |  |
Held-to-Maturity |  |
Amortized Cost | 92,994 |
Gross Unrealized Holding Gains | 5 |
Fair Value | 92,999 |
Short-term | Certificates of deposit |  |
Held-to-Maturity |  |
Amortized Cost | 44,506 |
Fair Value | 44,506 |
Short-term | Municipal securities |  |
Held-to-Maturity |  |
Amortized Cost | 611,370 | 744,542
Gross Unrealized Holding Gains | 319 | 105
Gross Unrealized Holding Losses | 10 |
Fair Value | 611,679 | 744,647
Continuous Unrealized Loss Position less than 12 Months | 10 |
Short-term | U.S. government agency securities |  |
Held-to-Maturity |  |
Amortized Cost | 487,495 | 9,199
Gross Unrealized Holding Gains | 23 |
Gross Unrealized Holding Losses | 4 | 1
Fair Value | 487,514 | 9,198
Continuous Unrealized Loss Position less than 12 Months | 4 |
Short-term | Auction rate securities |  |
Trading |  |
Fair Value | 1,487 | 3,910
Long-term | Municipal securities |  |
Held-to-Maturity |  |
Amortized Cost | 29,333 | 42,940
Gross Unrealized Holding Gains | 16 | 10
Gross Unrealized Holding Losses | 4 |
Fair Value | 29,345 | $ 42,950
Continuous Unrealized Loss Position less than 12 Months | 4 |
Long-term | U.S. government agency securities |  |
Held-to-Maturity |  |
Amortized Cost | 5,022 |
Gross Unrealized Holding Losses | 3 |
Fair Value | 5,019 |
Continuous Unrealized Loss Position less than 12 Months | $ 3 |

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