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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Increase for current year tax positions $ 3,487 $ 9,561 $ 12,620
Change in valuation allowance (700) 1,000  
Foreign net operating loss deferred tax assets 1,100    
Income from U.S. sources 403,000 294,000 167,000
Income from foreign sources 12,000 10,000 2,000
Research credits 12,188 15,373 20,547
Cash tax benefits resulting in net operating loss carryforward 6,000 6,000 7,000
Expiration of the statute of limitation for assessment of taxes 832 $ 1,482 $ 66
Foreign Country      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 45,000    
Domestic Country      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 28,000    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Increase for current year tax positions 4,000    
Change in valuation allowance 400    
Net operating loss carryforward 2,000    
Income tax credit carryforward 11,000    
Expiration of the statute of limitation for assessment of taxes $ 1,000