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FINANCIAL INSTRUMENTS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurements    
Equity investment $ 14,146 $ 14,146
Investments, Contingent Purchase Obligation 900  
Realized Investment Gains (Losses) 900  
Level 2    
Fair Value Measurements    
Cost 277,079 317,722
Gross Unrealized Gains 5 0
Gross Unrealized Losses (285) (454)
Fair Value 276,799 317,268
Short-term:    
Fair Value Measurements    
Cost 251,197  
Gross Unrealized Gains 0  
Gross Unrealized Losses (269)  
Short-term: | Level 2    
Fair Value Measurements    
Cost   257,456
Gross Unrealized Gains   0
Gross Unrealized Losses   (235)
Fair Value 250,928 257,221
Short-term: | Asset-backed Securities    
Fair Value Measurements    
Cost 34,873  
Gross Unrealized Gains 0  
Gross Unrealized Losses (33)  
Short-term: | Asset-backed Securities | Level 2    
Fair Value Measurements    
Cost   28,338
Gross Unrealized Gains   0
Gross Unrealized Losses   (37)
Fair Value 34,840 28,301
Short-term: | Commercial Paper    
Fair Value Measurements    
Cost 45,035  
Gross Unrealized Gains 0  
Gross Unrealized Losses (30)  
Short-term: | Commercial Paper | Level 2    
Fair Value Measurements    
Cost   48,999
Gross Unrealized Gains   0
Gross Unrealized Losses   (23)
Fair Value 45,005 48,976
Short-term: | Corporate bonds    
Fair Value Measurements    
Cost 171,289  
Gross Unrealized Gains 0  
Gross Unrealized Losses (206)  
Short-term: | Corporate bonds | Level 2    
Fair Value Measurements    
Cost   180,119
Gross Unrealized Gains   0
Gross Unrealized Losses   (175)
Fair Value 171,083 179,944
Long-term:    
Fair Value Measurements    
Cost 25,882  
Gross Unrealized Gains 5  
Gross Unrealized Losses (16)  
Long-term: | Level 2    
Fair Value Measurements    
Cost   60,266
Gross Unrealized Gains   0
Gross Unrealized Losses   (219)
Fair Value 25,871 60,047
Long-term: | Asset-backed Securities    
Fair Value Measurements    
Cost 9,383 23,836
Gross Unrealized Gains 5 0
Gross Unrealized Losses 0 (79)
Long-term: | Asset-backed Securities | Level 2    
Fair Value Measurements    
Fair Value 9,388 23,757
Long-term: | Corporate bonds    
Fair Value Measurements    
Cost 16,499  
Gross Unrealized Gains 0  
Gross Unrealized Losses (16)  
Long-term: | Corporate bonds | Level 2    
Fair Value Measurements    
Cost   36,430
Gross Unrealized Gains   0
Gross Unrealized Losses   (140)
Fair Value $ 16,483 $ 36,290