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EMPLOYEE RELATED LIABILITIES (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Severance pay fund, Israeli employees $ 10,711    
Long-term employee liabilties, Israeli employees 12,258    
Israeli employee termination benefits $ 5,059 $ 4,345 $ 3,986
Reduction to plan obiligation, USA employees   3,900  
TPSCo [Member]      
Matching contribution (as a percent) 10.00%    
Employee contribution (as a percent) 1.00%    
Cost recognized $ 6,706 $ 7,015 $ 6,823