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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.