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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]    
Investments, Amortized Cost Basis $ 285,988 $ 300,333
Investments, Gross Unrealized Gains 8 4
Investments, Gross Unrealized Losses (406) (169)
Investments 285,590 300,168
Certificates of Deposit [Member]    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents, at Carrying Value 11,513 11,532
Cash Equivalents, Gross Unrealized Gain 8 3
Cash Equivalents, Gross Unrealized Losses (3) (14)
Cash and Cash Equivalents, Fair Value Disclosure 11,518 11,521
Corporate Debt Securities [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 229,513 233,848
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses (122) (139)
Available-for-sale Securities, Fair Value Disclosure 229,391 233,709
US Treasury and Government [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 44,962 54,953
Available-for-sale Securities, Gross Unrealized Gains 0 1
Available-for-sale Securities, Gross Unrealized Losses (281) (16)
Available-for-sale Securities, Fair Value Disclosure $ 44,681 $ 54,938