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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | $ 2,175,417 | $ 370,323 | $ 211,349 | $ 222,514
Short-term investments | 744,610 | 781,134 |  |
Investments | 15,348 | 42,940 |  |
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 | 2,175,417 | 370,323 |  |
Short-term investments | 744,610 | 781,134 |  |
Accounts receivable, net | 371 | 83 |  |
Investments | 15,348 | 42,940 |  |
Prepaid expenses and other current assets |  | 250 |  |
Accrued liabilities | (588) | (335) |  |
Assets measured at fair value | 2,935,158 | 1,194,395 |  |
Cash | 255,723 | 196,090 |  |
Assets measured at fair value | 2,935,158 | 1,194,395 |  |
Money market funds | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 664,005 | 106,928 |  |
Assets measured at fair value | 664,005 | 106,928 |  |
Commercial paper | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 430,605 | 19,482 |  |
Assets measured at fair value | 430,605 | 19,482 |  |
Municipal securities | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 731,744 | 854,787 |  |
Assets measured at fair value | 731,744 | 854,787 |  |
U.S. government agency securities | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 508,256 | 9,199 |  |
Assets measured at fair value | 508,256 | 9,199 |  |
Variable rate demand notes | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 4,001 |  |
Assets measured at fair value |  | 4,001 |  |
Auction rate securities | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 3,910 |  |
Assets measured at fair value |  | 3,910 |  |
Put options | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 250 |  |
Assets measured at fair value |  | 250 |  |
Foreign currency exchange contracts | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Foreign currency derivatives | (217) | (252) |  |
U.S. Treasuries | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 260,035 |  |  |
Assets measured at fair value | 260,035 |  |  |
Certificates of deposit | Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 85,007 |  |  |
Assets measured at fair value | 85,007 |  |  |
Level 1 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 919,728 | 303,018 |  |
Assets measured at fair value | 919,728 | 303,018 |  |
Cash | 255,723 | 196,090 |  |
Assets measured at fair value | 919,728 | 303,018 |  |
Level 1 | Money market funds |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 664,005 | 106,928 |  |
Assets measured at fair value | 664,005 | 106,928 |  |
Level 2 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 1,255,689 | 67,305 |  |
Short-term investments | 744,610 | 777,224 |  |
Accounts receivable, net | 371 | 83 |  |
Investments | 15,348 | 42,940 |  |
Accrued liabilities | (588) | (335) |  |
Assets measured at fair value | 2,015,430 | 887,217 |  |
Assets measured at fair value | 2,015,430 | 887,217 |  |
Level 2 | Commercial paper |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 430,605 | 19,482 |  |
Assets measured at fair value | 430,605 | 19,482 |  |
Level 2 | Municipal securities |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 731,744 | 854,787 |  |
Assets measured at fair value | 731,744 | 854,787 |  |
Level 2 | U.S. government agency securities |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 508,256 | 9,199 |  |
Assets measured at fair value | 508,256 | 9,199 |  |
Level 2 | Variable rate demand notes |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 4,001 |  |
Assets measured at fair value |  | 4,001 |  |
Level 2 | Foreign currency exchange contracts |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Foreign currency derivatives | (217) | (252) |  |
Level 2 | U.S. Treasuries |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 260,035 |  |  |
Assets measured at fair value | 260,035 |  |  |
Level 2 | Certificates of deposit |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value | 85,007 |  |  |
Assets measured at fair value | $ 85,007 |  |  |
Level 3 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Short-term investments |  | 3,910 |  |
Prepaid expenses and other current assets |  | 250 |  |
Assets measured at fair value |  | 4,160 |  |
Assets measured at fair value |  | 4,160 |  |
Level 3 | Auction rate securities |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 3,910 |  |
Assets measured at fair value |  | 3,910 |  |
Level 3 | Put options |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Assets measured at fair value |  | 250 |  |
Assets measured at fair value |  | $ 250 |  |

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13487-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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