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CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]    
Investments, Amortized Cost Basis $ 262,346 $ 300,333
Investments, Gross Unrealized Gains 21 4
Investments, Gross Unrealized Losses (317) (169)
Investments 262,050 300,168
Certificates of Deposit [Member]    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents, at Carrying Value 10,626 11,532
Cash Equivalents, Gross Unrealized Gain 9 3
Cash Equivalents, Gross Unrealized Losses (2) (14)
Cash and Cash Equivalents, Fair Value Disclosure 10,633 11,521
Corporate Debt Securities [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 234,222 233,848
Available-for-sale Securities, Gross Unrealized Gains 12  
Available-for-sale Securities, Gross Unrealized Losses (53) (139)
Available-for-sale Securities, Fair Value Disclosure 234,181 233,709
US Treasury and Government [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 17,498 54,953
Available-for-sale Securities, Gross Unrealized Gains   1
Available-for-sale Securities, Gross Unrealized Losses (262) (16)
Available-for-sale Securities, Fair Value Disclosure $ 17,236 $ 54,938