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SEGMENT REPORTING (Reconciliation of Reporting Information from Segments to Consolidated Totals) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Total revenues of reportable segment and consolidated revenues $ 120,794 $ 113,447  
Operating Income      
Total operating income for reportable segments 30,331 27,969  
Financing income, net 568 841  
Consolidated income before taxes on income 30,899 28,810  
Assets      
Current assets 133,794   $ 137,112
Property and equipment, net 37,232   39,047
Total assets 207,168   215,159
Other significant items      
Expenditures for assets 7,084 3,096  
Asset expenditures, reportable segments and unallocated amounts 9,801 6,255  
Depreciation, amortization and impairment for reportable segments 4,735 4,980  
Depreciation and amortization, unallocated amounts 1,954 1,487  
Depreciation and amortization 6,689 6,467  
Reportable Segment [Member]      
Assets      
Total assets [1] 98,617   116,353
Other significant items      
Expenditure for assets unallocated amounts 2,717 3,159  
Expenditures for assets 7,084 $ 3,096  
Segment Reconciling Items [Member]      
Assets      
Current assets 68,350   59,412
Investments in affiliated and other companies 15,960   16,221
Property and equipment, net 15,005   15,092
Other unallocated amounts $ 9,236   $ 8,081
[1] Including goodwill.