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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]      
Trading gains $ 115,000 $ 666,000 $ 133,000
Allowance for doubtful accounts receivable 2,180,000 2,063,000  
Intangible asset impairment loss   255,000  
Goodwill 3,406,000 3,356,000 4,041,000
Goodwill impairment loss   674,000 879,000
Severance expenses 1,595,000 1,386,000 1,460,000
Advertising expenses 6,900,000 $ 6,800,000 $ 6,700,000
Deferred expenses amortization period   20 months  
Investment impairment loss $ 0 $ 0  
Antidilutive shares 0    
Certain Reporting Units [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Goodwill   700,000  
Goodwill impairment loss   700,000  
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%