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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Estimated Useful Lives for Calculation of Depreciation) (Details)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives Shorter of the remaining lease terms or estimated useful lives
Building [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 20 years
Building [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 40 years
Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Office And Computer Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Office And Computer Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years