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FINANCIAL INSTRUMENTS (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements    
Cost $ 115,495 $ 143,649
Gross Unrealized Gains 33 13
Gross Unrealized Losses (85) (93)
Level 2    
Fair Value Measurements    
Fair Value 115,443 143,569
Short-term Investments [Member]    
Fair Value Measurements    
Cost 101,994 119,186
Gross Unrealized Gains 33 3
Gross Unrealized Losses (46) (51)
Short-term Investments [Member] | Level 2    
Fair Value Measurements    
Fair Value 101,981 119,138
Short-term Investments [Member] | Asset-backed Securities    
Fair Value Measurements    
Cost 27,484 15,009
Gross Unrealized Gains 0 0
Gross Unrealized Losses (15) (9)
Short-term Investments [Member] | Asset-backed Securities | Level 2    
Fair Value Measurements    
Fair Value 27,469 15,000
Short-term Investments [Member] | Commercial Paper    
Fair Value Measurements    
Cost 35,191 1,747
Gross Unrealized Gains 31 3
Gross Unrealized Losses 0 0
Short-term Investments [Member] | Commercial Paper | Level 2    
Fair Value Measurements    
Fair Value 35,222 1,750
Short-term Investments [Member] | Corporate bonds    
Fair Value Measurements    
Cost 39,319 102,430
Gross Unrealized Gains 2 0
Gross Unrealized Losses (31) (42)
Short-term Investments [Member] | Corporate bonds | Level 2    
Fair Value Measurements    
Fair Value 39,290 102,388
Long-Term Investments [Member] | Corporate bonds    
Fair Value Measurements    
Cost 13,501 24,463
Gross Unrealized Gains 0 10
Gross Unrealized Losses (39) (42)
Long-Term Investments [Member] | Corporate bonds | Level 2    
Fair Value Measurements    
Fair Value $ 13,462 $ 24,431