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CASH, MONEY MARKET FUNDS, AND SHORT-TERM INVESTMENTS (Schedule of Gross Unrealized Gains and Losses) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Schedule of Cost-method Investments [Line Items]  
Amortized Cost $ 99,897
Gross Unrealized Gains $ 38
Gross Unrealized Losses
Fair Value $ 99,936
Money Market Funds [Member]  
Schedule of Cost-method Investments [Line Items]  
Amortized Cost $ 20,562
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value $ 20,562
Corporate Debt Securities [Member]  
Schedule of Cost-method Investments [Line Items]  
Amortized Cost 79,336
Gross Unrealized Gains $ 38
Gross Unrealized Losses
Fair Value $ 79,374