FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - SCHEDULE OF ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Marketable securities	$ 89,342	$ 39,200
Fair Value on a Recurring Basis
Assets:
Total	984,635	1,080,096
Liabilities:
Contingent consideration arrangements	(33,871)	(33,873)
Fair Value on a Recurring Basis \| Money market funds
Assets:
Cash equivalents	667,662	601,848
Fair Value on a Recurring Basis \| Time deposits
Assets:
Cash equivalents	79,000	125,038
Fair Value on a Recurring Basis \| Treasury discount notes
Assets:
Cash equivalents	24,991
Marketable securities	34,974
Fair Value on a Recurring Basis \| Commercial paper
Assets:
Cash equivalents	123,640	302,418
Marketable securities	49,797
Fair Value on a Recurring Basis \| Corporate debt securities
Assets:
Marketable securities	4,571	27,578
Fair Value on a Recurring Basis \| Equity security
Assets:
Marketable securities		11,622
Long-term investments		7,542
Fair Value on a Recurring Basis \| Auction rate security
Assets:
Long-term investments		4,050
Fair Value on a Recurring Basis \| Level 1
Assets:
Total	727,627	621,012
Liabilities:
Contingent consideration arrangements	0	0
Fair Value on a Recurring Basis \| Level 1 \| Money market funds
Assets:
Cash equivalents	667,662	601,848
Fair Value on a Recurring Basis \| Level 1 \| Time deposits
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Level 1 \| Treasury discount notes
Assets:
Cash equivalents	24,991
Marketable securities	34,974
Fair Value on a Recurring Basis \| Level 1 \| Commercial paper
Assets:
Cash equivalents	0	0
Marketable securities	0
Fair Value on a Recurring Basis \| Level 1 \| Corporate debt securities
Assets:
Marketable securities	0	0
Fair Value on a Recurring Basis \| Level 1 \| Equity security
Assets:
Marketable securities		11,622
Long-term investments		7,542
Fair Value on a Recurring Basis \| Level 1 \| Auction rate security
Assets:
Long-term investments		0
Fair Value on a Recurring Basis \| Level 2
Assets:
Total	257,008	455,034
Liabilities:
Contingent consideration arrangements	0	0
Fair Value on a Recurring Basis \| Level 2 \| Money market funds
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Level 2 \| Time deposits
Assets:
Cash equivalents	79,000	125,038
Fair Value on a Recurring Basis \| Level 2 \| Treasury discount notes
Assets:
Cash equivalents	0
Marketable securities	0
Fair Value on a Recurring Basis \| Level 2 \| Commercial paper
Assets:
Cash equivalents	123,640	302,418
Marketable securities	49,797
Fair Value on a Recurring Basis \| Level 2 \| Corporate debt securities
Assets:
Marketable securities	4,571	27,578
Fair Value on a Recurring Basis \| Level 2 \| Equity security
Assets:
Marketable securities		0
Long-term investments		0
Fair Value on a Recurring Basis \| Level 2 \| Auction rate security
Assets:
Long-term investments		0
Fair Value on a Recurring Basis \| Level 3
Assets:
Total	0	4,050
Liabilities:
Contingent consideration arrangements	(33,871)	(33,873)
Fair Value on a Recurring Basis \| Level 3 \| Money market funds
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Level 3 \| Time deposits
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Level 3 \| Treasury discount notes
Assets:
Cash equivalents	0
Marketable securities	0
Fair Value on a Recurring Basis \| Level 3 \| Commercial paper
Assets:
Cash equivalents	0	0
Marketable securities	0
Fair Value on a Recurring Basis \| Level 3 \| Corporate debt securities
Assets:
Marketable securities	$ 0	0
Fair Value on a Recurring Basis \| Level 3 \| Equity security
Assets:
Marketable securities		0
Long-term investments		0
Fair Value on a Recurring Basis \| Level 3 \| Auction rate security
Assets:
Long-term investments		$ 4,050

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion 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.

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