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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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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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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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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