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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 2,257,266 $ 2,016,613 $ 1,749,561
Other comprehensive income before reclassifications 21,201 14,213  
Amounts reclassified from accumulated other comprehensive loss (4,564) (896)  
Net current-period other comprehensive income 16,637 13,317 (13,702)
Ending balance 2,588,484 2,257,266 2,016,613
Unrealized gains (losses) on marketable securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income before reclassifications   6,260  
Unrealized gains (losses) on cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income before reclassifications   5,495  
Foreign currency translation adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income before reclassifications   2,458  
Total      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (33,299) (46,616)  
Ending balance (16,662) (33,299) (46,616)
Unrealized gains (losses) on marketable securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 4,131 (1,662)  
Other comprehensive income before reclassifications 11,249    
Amounts reclassified from accumulated other comprehensive loss (2,095) (467)  
Net current-period other comprehensive income 9,154 5,793  
Ending balance 13,285 4,131 (1,662)
Unrealized gains (losses) on cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 2,351 (2,715)  
Other comprehensive income before reclassifications 4,954    
Amounts reclassified from accumulated other comprehensive loss (2,469) (429)  
Net current-period other comprehensive income 2,485 5,066  
Ending balance 4,836 2,351 (2,715)
Foreign currency translation adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (39,781) (42,239)  
Other comprehensive income before reclassifications 4,998    
Amounts reclassified from accumulated other comprehensive loss 0 0  
Net current-period other comprehensive income 4,998 2,458  
Ending balance $ (34,783) $ (39,781) $ (42,239)