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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair value amounts included in the carrying value of |  |  |  |  |
Cash and cash equivalents | $ 576,337 | $ 377,582 | $ 2,528,109 | $ 377,582 | $ 2,175,417
Short-term investments | 209,366 | 220,554 |  |  |
Investments | 477 | 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 | 576,337 | 377,582 |  |  |
Short-term investments | 209,366 | 220,554 |  |  |
Accounts receivable, net | 924 | 236 |  |  |
Investments | 477 | 2,394 |  |  |
Accrued liabilities | (74) | (764) |  |  |
Assets measured at fair value | 787,030 | 600,002 |  |  |
Cash | 288,457 | 278,972 |  |  |
Foreign currency derivatives | 850 | (528) |  |  |
Money market funds | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 211,237 | 76,112 |  |  |
Certificates of deposit | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 37,189 |  |  |  |
Commercial paper | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 54,443 | 47,855 |  |  |
Variable rate demand notes | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 25,730 | 13,923 |  |  |
Municipal securities | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 159,054 | 157,617 |  |  |
U.S. government agency securities | Total fair value |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 10,070 | 26,051 |  |  |
Level 1 |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Cash and cash equivalents | 499,694 | 355,084 |  |  |
Assets measured at fair value | 499,694 | 355,084 |  |  |
Cash | 288,457 | 278,972 |  |  |
Level 1 | Money market funds |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 211,237 | 76,112 |  |  |
Level 2 |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Cash and cash equivalents | 76,643 | 22,498 |  |  |
Short-term investments | 209,366 | 220,554 |  |  |
Accounts receivable, net | 924 | 236 |  |  |
Investments | 477 | 2,394 |  |  |
Accrued liabilities | (74) | (764) |  |  |
Assets measured at fair value | 287,336 | 244,918 |  |  |
Foreign currency derivatives | 850 | (528) |  |  |
Level 2 | Certificates of deposit |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 37,189 |  |  |  |
Level 2 | Commercial paper |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 54,443 | 47,855 |  |  |
Level 2 | Variable rate demand notes |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 25,730 | 13,923 |  |  |
Level 2 | Municipal securities |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | 159,054 | 157,617 |  |  |
Level 2 | U.S. government agency securities |  |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |  |
Assets measured at fair value | $ 10,070 | $ 26,051 |  |  |

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