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SEGMENT REPORTING (Reconciliation of Reporting Information from Segments to Consolidated Totals) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues of reportable segment and consolidated revenues $ 253,335 $ 234,636 $ 199,574
Operating Income      
Total operating income for reportable segments 62,378 56,535 47,998
Other income, net 13,138
Consolidated income before taxes on income 76,233 55,546 50,054
Assets      
Current assets 188,906 137,112  
Property and equipment, net 50,460 39,047 35,644
Total assets 373,792 215,159 178,019
Other significant items      
Expenditures for assets 16,214 10,027 9,331
Asset expenditures, reportable segments and unallocated amounts 21,382 16,308 13,829
Depreciation, amortization and impairment for reportable segments 9,116 10,358 9,160
Depreciation and amortization 14,608 13,519 11,635
Segment Reconciling Items [Member]      
Operating Income      
Financing income, net 717 (989) 2,056
Assets      
Current assets 103,994 59,412 43,874
Investments in affiliated and other companies 7,644 16,221 12,060
Property and equipment, net 20,074 15,092 10,912
Other unallocated amounts 41,524 8,081 7,197
Other significant items      
Expenditure for assets unallocated amounts 5,168 6,281 4,498
Depreciation and amortization, unallocated amounts 5,492 3,161 2,475
Reportable Segment [Member]      
Operating Income      
Total operating income for reportable segments 62,378 56,535 47,998
Assets      
Total assets [1] 200,556 116,353 103,976
Other significant items      
Expenditures for assets 16,214 10,027 9,331
Depreciation, amortization and impairment for reportable segments $ 9,116 $ 10,358 $ 9,160
[1] Including goodwill.