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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 13, 2018
Mar. 31, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2021
Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items]                    
Shares issued during period     373,489              
Trading gains         $ 166 $ 397 $ 115      
Allowance for doubtful accounts receivable         3,512 2,532        
Goodwill $ 59,402       62,896 3,777 3,406 [1]      
Severance expenses         1,461 1,309 1,087      
Advertising expenses         8,100 8,500 $ 6,900      
Deferred expenses amortization period               20 months    
Intangible assets fair value         $ 38,583          
Cumulative adjustment to retained earnings           $ 3,000        
Maximum [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Ownership percentage, equity method         50.00%          
Operating lease right of use assets         $ 10,000          
Minimum [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Ownership percentage, equity method         20.00%          
Operating lease right of use assets         $ 8,000          
Subsequent Event [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Shares issued during period       373,489            
Goodwill, fair value                   $ 59,400
Road Track [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Bussiness acquisition percentage 81.30%                  
Amount paid to shareholders $ 91,700                  
Purchase price 113,000                  
Payment in cash 75,700                  
Additional amount paid 12,000                  
Remaining amount paid as bonus 4,000                  
Goodwill $ 59,402                  
Road Track [Member] | Subsequent Event [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Bussiness acquisition percentage                 18.70%  
Shares issued during period   373,489                
One reporting unit [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Goodwill         59,400          
Two different reporting [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Goodwill         $ 3,500          
[1] The accumulated amount of goodwill impairment loss as of December 31, 2018, 2017 and 2016 was US$ 7,098,000.