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SEGMENT REPORTING (Reconciliation of Reporting Information from Segments to Consolidated Totals) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total revenues of reportable segment and consolidated revenues $ 234,636 $ 199,574 $ 175,628
Operating Income      
Total operating income for reportable segments 56,535 47,998 40,644
Consolidated income before taxes on income 55,546 50,054 41,833
Assets      
Current assets 137,112 111,189  
Property and equipment, net 39,047 35,644 31,514
Total assets 215,159 178,019  
Other significant items      
Expenditures for assets 10,027 9,331 14,871
Asset expenditures, reportable segments and unallocated amounts 16,308 13,829 18,547
Depreciation, amortization and impairment for reportable segments 10,358 9,160 8,788
Depreciation and amortization 13,519 11,635 11,962
Reportable Segment [Member]      
Operating Income      
Total operating income for reportable segments 56,535 47,998 40,644
Assets      
Total assets [1] 116,353 103,976 76,055
Other significant items      
Expenditures for assets 10,027 9,331 14,871
Depreciation, amortization and impairment for reportable segments 10,358 9,160 9,717
Segment Reconciling Items [Member]      
Operating Income      
Financing income, net (989) 2,056 1,189
Assets      
Current assets 59,412 43,874 46,119
Investments in affiliated and other companies 16,221 12,060 4,783
Property and equipment, net 15,092 10,912 8,730
Other unallocated amounts 8,081 7,197 6,316
Other significant items      
Expenditure for assets unallocated amounts 6,281 4,498 3,676
Depreciation and amortization, unallocated amounts $ 3,161 $ 2,475 $ 2,245
[1] Including goodwill.