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FINANCIAL INSTRUMENTS (Financial expenses, net) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Financial Instruments [Abstract]    
Interest expense on financial liabilities recorded at amortized cost $ 17,126,000 $ 12,568,000
Bank and other financial charges 8,025,000 6,348,000
Interest accretion on discounted provisions 311,000 336,000
Foreign exchange (gain) loss (1,276,000) 434,000
Financial expenses, net (note 14(c)) 24,186,000 19,686,000
Borrowing costs recognised as expense $ 1,200,000.0 $ 200,000