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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2019
Significant Accounting Policies [Line Items]        
Weighted average interest rates, bank deposit 2.27% 2.92%    
Employees entitled severance monthly deposit, as a percentage of salary 8.33%      
Severance expense $ 4,035,000 $ 3,326,000 $ 2,707,000  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 100.00%      
Maximum annual contribution per employee $ 19,000      
Matching contribution expense 2,697,000 2,171,000 1,677,000  
Marketing expenses 20,055,000 16,171,000 14,106,000  
Aggregate amount of the transaction price allocated to remaining performance obligation $ 293,000,000      
Revenue remaining performance obligations percentage 55.00%      
Deferred revenues recognized in the period that were included in the deferred revenues balance as of December 31, 2018 $ 87,926,000      
Prepaid expenses and other current assets 8,406,000 6,349,000    
Other long-term assets 72,091,000 31,863,000    
Deposits in other long-term assets 4,313,000 3,579,000    
Accrued severance payable liability 6,751,000 5,597,000    
Amortization of deferred contract costs 33,853,000 27,807,000    
Issuance costs attributable to liability 12,900,000      
Issuance costs attributable to equity components 2,000,000.0      
Long-term unbilled receivables $ 5,526,000      
Convertible Senior Note [Member]        
Significant Accounting Policies [Line Items]        
Effective interest rate 3.50%     0.00%
Deferred contract costs [Member]        
Significant Accounting Policies [Line Items]        
Prepaid expenses and other current assets $ 1,014,000 389,000    
Other long-term assets $ 37,074,000 25,595,000    
First 3% of Employee Contribution [Member]        
Significant Accounting Policies [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 3.00%      
Next 2% of Employee Contribution [Member]        
Significant Accounting Policies [Line Items]        
Maximum annual contribution per employee $ 11,200      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 2.00%      
Employees Over Fifty Years [Member]        
Significant Accounting Policies [Line Items]        
Maximum annual contribution per employee $ 25,000      
Minimum [Member]        
Significant Accounting Policies [Line Items]        
Intangible assets, useful life 2 years      
Expected impact from recognition of ROU assets and liabilities on 2019 consolidated balance sheet $ 26,000,000.0      
Minimum [Member] | Software and Software Development Costs [Member]        
Significant Accounting Policies [Line Items]        
Contracts costs amortized useful life 3 years      
Minimum [Member] | Software [Member]        
Significant Accounting Policies [Line Items]        
Intangible assets, useful life 1 year      
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Intangible assets, useful life 11 years      
Expected impact from recognition of ROU assets and liabilities on 2019 consolidated balance sheet $ 26,700,000      
Maximum [Member] | Software and Software Development Costs [Member]        
Significant Accounting Policies [Line Items]        
Contracts costs amortized useful life 5 years      
Maximum [Member] | Software [Member]        
Significant Accounting Policies [Line Items]        
Intangible assets, useful life 3 years      
Foreign Exchange Forward and Option [Member]        
Significant Accounting Policies [Line Items]        
Accumulated other comprehensive gain (loss) from currency forward and option transactions $ 254,000 (727,000)    
Accumulated other comprehensive gain (loss) from currency forward and option transactions, tax 35,000 (99,000)    
Notional amounts 16,855,000      
Fair value of derivative asset 514,000 1,004,000    
Foreign Exchange Forward and Option [Member] | Derivative Liabilities [Member]        
Significant Accounting Policies [Line Items]        
Fair value of derivative liability 134,000 0    
Foreign Exchange Forward [Member]        
Significant Accounting Policies [Line Items]        
Notional amounts 17,648,000      
Financial income net from hedging transaction, net 515,000 977,000 $ (796,000)  
Foreign Exchange Forward [Member] | Derivative Assets [Member]        
Significant Accounting Policies [Line Items]        
Fair value of derivative asset 288,000 10,000    
Foreign Exchange Forward [Member] | Derivative Liabilities [Member]        
Significant Accounting Policies [Line Items]        
Fair value of derivative liability $ 0 $ 836,000