FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Marketable securities:	$ 160,648	$ 6,004
Fair value on a recurring basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total Assets	183,581	715,014
Fair value on a recurring basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Money Market Funds [Member]
Assets:
Cash equivalents:	174,720	698,307
Fair value on a recurring basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Equity security
Assets:
Marketable securities:	1,451	4,996
Long-term investments:	7,410	11,711
Fair value on a recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Total Assets	590,912	45,333
Fair value on a recurring basis \| Significant Other Observable Inputs (Level 2) \| Commercial Paper [Member]
Assets:
Cash equivalents:	388,801	12,000
Fair value on a recurring basis \| Significant Other Observable Inputs (Level 2) \| Time deposits
Assets:
Cash equivalents:	42,914	32,325
Fair value on a recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate debt securities
Assets:
Marketable securities:	159,197	1,008
Fair value on a recurring basis \| Significant Unobservable Inputs (Level 3)
Assets:
Total Assets	6,070	8,920
Business Combination, Contingent Consideration, Liability	30,140	45,828
Fair value on a recurring basis \| Significant Unobservable Inputs (Level 3) \| Auction rate securities
Assets:
Long-term investments:	6,070	8,920
Fair Value \| Fair value on a recurring basis
Assets:
Total Assets	780,563	769,267
Business Combination, Contingent Consideration, Liability	30,140	45,828
Fair Value \| Fair value on a recurring basis \| Money Market Funds [Member]
Assets:
Cash equivalents:	174,720	698,307
Fair Value \| Fair value on a recurring basis \| Commercial Paper [Member]
Assets:
Cash equivalents:	388,801	12,000
Fair Value \| Fair value on a recurring basis \| Time deposits
Assets:
Cash equivalents:	42,914	32,325
Fair Value \| Fair value on a recurring basis \| Corporate debt securities
Assets:
Marketable securities:	159,197	1,008
Fair Value \| Fair value on a recurring basis \| Equity security
Assets:
Marketable securities:	1,451	4,996
Long-term investments:	7,410	11,711
Fair Value \| Fair value on a recurring basis \| Auction rate securities
Assets:
Long-term investments:	$ 6,070	$ 8,920

- Definition

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.

+ References+ Details