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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Trading gains | $ 397 | $ 115 | $ 666 |
Allowance for doubtful accounts receivable | 2,532 | 2,180 |  |
Intangible asset impairment loss |  |  | 255 |
Goodwill | 3,777 | 3,406 | 3,356 | [1]
Goodwill impairment loss |  |  | 674 |
Severance expenses | 1,853 | 1,595 | 1,386 |
Advertising expenses | 8,500 | $ 6,900 | $ 6,800 |
Deferred expenses amortization period |  |  | 20 months |
Cumulative adjustment to retained earnings | $ 3,000 |  |  |
Certain Reporting Units [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill |  |  | $ 700 |
Goodwill impairment loss |  |  | 700 |
Goodwill, fair value |  |  | $ 0 |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage, equity method | 50.00% |  |  |
Intangible assets finite lived, useful life | 10 years |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage, equity method | 20.00% |  |  |
[1] | The accumulated amount of goodwill impairment loss as of December 31, 2017, 2016 and 2015 was US$ 7,098,000.

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