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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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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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Fair value portion of accrued expenses.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair value amounts included in the carrying value of
Cash and cash equivalents	$ 377,582	$ 2,175,417	$ 370,323	$ 211,349
Short-term investments	220,554	744,610
Investments	2,394	15,348
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	377,582	2,175,417
Short-term investments	220,554	744,610
Accounts receivable, net	236	371
Investments	2,394	15,348
Accrued liabilities	(764)	(588)
Assets measured at fair value	600,002	2,935,158
Cash	278,972	255,723
Foreign currency derivatives	(528)	(217)
Money market funds \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value	76,112	664,005
Certificates of deposit \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value		85,007
Commercial paper \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value	47,855	430,605
Variable rate demand notes \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value	13,923
U.S. Treasuries \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value		260,035
Municipal securities \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value	157,617	731,744
U.S. government agency securities \| Total fair value
Fair value amounts included in the carrying value of
Assets measured at fair value	26,051	508,256
Level 1
Fair value amounts included in the carrying value of
Cash and cash equivalents	355,084	919,728
Assets measured at fair value	355,084	919,728
Cash	278,972	255,723
Level 1 \| Money market funds
Fair value amounts included in the carrying value of
Assets measured at fair value	76,112	664,005
Level 2
Fair value amounts included in the carrying value of
Cash and cash equivalents	22,498	1,255,689
Short-term investments	220,554	744,610
Accounts receivable, net	236	371
Investments	2,394	15,348
Accrued liabilities	(764)	(588)
Assets measured at fair value	244,918	2,015,430
Foreign currency derivatives	(528)	(217)
Level 2 \| Certificates of deposit
Fair value amounts included in the carrying value of
Assets measured at fair value		85,007
Level 2 \| Commercial paper
Fair value amounts included in the carrying value of
Assets measured at fair value	47,855	430,605
Level 2 \| Variable rate demand notes
Fair value amounts included in the carrying value of
Assets measured at fair value	13,923
Level 2 \| U.S. Treasuries
Fair value amounts included in the carrying value of
Assets measured at fair value		260,035
Level 2 \| Municipal securities
Fair value amounts included in the carrying value of
Assets measured at fair value	157,617	731,744
Level 2 \| U.S. government agency securities
Fair value amounts included in the carrying value of
Assets measured at fair value	$ 26,051	$ 508,256