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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]    
Investments, Amortized Cost Basis $ 250,918 $ 246,171
Investments, Gross Unrealized Gains 21 18
Investments, Gross Unrealized Losses (65) (54)
Investments 250,874 246,135
Certificates of Deposit [Member]    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents, at Carrying Value 11,535 11,373
Cash equivalents, Unrealized Gains 14 4
Cash Equivalents, Gross Unrealized Losses (5) (13)
Cash equivalents 11,544 11,364
Corporate Bonds [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 233,923 228,799
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 7 14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 56 41
Available-for-sale Securities 233,874 228,772
US Government [Member]    
Cash and Cash Equivalents [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 5,460 5,999
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 4 0
Available-for-sale Securities $ 5,456 $ 5,999