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INCOME TAXES (Schedule of Profit (Loss) Before Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit (loss) before taxes      
Domestic $ 198,008 $ 168,668 $ (59,797)
Foreign [1] 3,760 41,930 18,392
PROFIT (LOSS) BEFORE INCOME TAX $ 201,768 $ 210,598 $ (41,405)
[1] Foreign are provisions related to Tower's Japanese and US subsidiaries.