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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Long-Lived Assets by Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 419,111us-gaap_PropertyPlantAndEquipmentNet $ 350,039us-gaap_PropertyPlantAndEquipmentNet
Israel [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets 145,816us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_IL
180,976us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_IL
USA [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets 66,953us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
75,040us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Japan [Member]    
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 206,342us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_JP
$ 94,023us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_JP