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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Long-Lived Assets by Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 635,124 $ 616,686
Israel [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets 218,810 215,511
USA [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets 214,393 203,501
Japan [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 201,921 $ 197,674