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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Total fair value |  |
Fair value of certain assets |  |
Cash | $ 194,242 | $ 196,090
Foreign currency derivatives | (570) | (252)
Assets measured at fair value | 2,819,260 | 1,194,395
Money market funds | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 624,007 | 106,928
Commercial paper | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 361,833 | 19,482
Municipal securities | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 670,186 | 854,787
U.S. government agency securities | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 740,525 | 9,199
Variable rate demand notes | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value |  | 4,001
Auction rate securities | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 1,487 | 3,910
Put options | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 48 | 250
U.S. Treasuries | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 111,993 |
Certificates of deposit | Total fair value |  |
Fair value of certain assets |  |
Assets measured at fair value | 115,509 |
Level 1 |  |
Fair value of certain assets |  |
Cash | 194,242 | 196,090
Assets measured at fair value | 818,249 | 303,018
Level 1 | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 624,007 | 106,928
Level 2 |  |
Fair value of certain assets |  |
Foreign currency derivatives | (570) | (252)
Assets measured at fair value | 1,999,476 | 887,217
Level 2 | Commercial paper |  |
Fair value of certain assets |  |
Assets measured at fair value | 361,833 | 19,482
Level 2 | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 670,186 | 854,787
Level 2 | U.S. government agency securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 740,525 | 9,199
Level 2 | Variable rate demand notes |  |
Fair value of certain assets |  |
Assets measured at fair value |  | 4,001
Level 2 | U.S. Treasuries |  |
Fair value of certain assets |  |
Assets measured at fair value | 111,993 |
Level 2 | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 115,509 |
Level 3 |  |
Fair value of certain assets |  |
Assets measured at fair value | 1,535 | 4,160
Level 3 | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 1,487 | 3,910
Level 3 | Put options |  |
Fair value of certain assets |  |
Assets measured at fair value | $ 48 | $ 250

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