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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | $ 777,655 | $ 377,582 | $ 434,769 | $ 2,175,417
Short-term investments | 323,851 | 220,554 |  |
Investments | 48,639 | 2,394 |  |
Asset transfers between Level 1 and Level 2 measurements | 0 | 0 |  |
Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 777,655 | 377,582 |  |
Short-term investments | 323,851 | 220,554 |  |
Accounts receivable, net | 853 | 236 |  |
Investments | 48,639 | 2,394 |  |
Accrued liabilities | (371) | (764) |  |
Assets measured at fair value | 1,150,627 | 600,002 |  |
Cash | 311,631 | 278,972 |  |
Foreign currency derivatives | 482 | (528) |  |
Money market funds | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 363,656 | 76,112 |  |
Certificates of deposit | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 57,756 |  |  |
Commercial paper | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 90,257 | 47,855 |  |
Variable rate demand notes | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 32,905 | 13,923 |  |
Municipal securities | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 234,558 | 157,617 |  |
U.S. government agency securities | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 59,382 | 26,051 |  |
Level 1 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 675,287 | 355,084 |  |
Assets measured at fair value | 675,287 | 355,084 |  |
Cash | 311,631 | 278,972 |  |
Level 1 | Money market funds |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 363,656 | 76,112 |  |
Level 2 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 102,368 | 22,498 |  |
Short-term investments | 323,851 | 220,554 |  |
Accounts receivable, net | 853 | 236 |  |
Investments | 48,639 | 2,394 |  |
Accrued liabilities | (371) | (764) |  |
Assets measured at fair value | 475,340 | 244,918 |  |
Foreign currency derivatives | 482 | (528) |  |
Level 2 | Certificates of deposit |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 57,756 |  |  |
Level 2 | Commercial paper |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 90,257 | 47,855 |  |
Level 2 | Variable rate demand notes |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 32,905 | 13,923 |  |
Level 2 | Municipal securities |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 234,558 | 157,617 |  |
Level 2 | U.S. government agency securities |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | $ 59,382 | $ 26,051 |  |

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