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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.

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