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The amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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No definition available.

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Represents the portion of the balance sheet assertion valued at fair value by the entity, whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with fair value disclosures required in footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure, in the same submission. It represents the fair value of assets categorized as prepaid expenses and other current assets.

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No definition available.

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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.

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-Name Regulation S-X (SX)
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Fair value portion of accrued expenses.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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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