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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 30, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax effect from change in tax rate $ (1,600) $ 2,048 $ (1,633)
Net deferred tax expenses     3,300
Increase in non-recognition of deferred income tax assets     56,500
Tax effect from revaluation of deferred income tax liabilities   0 (62,228)
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce current tax expense $ 67,200 85,700 67,200
Non-deductible reserves and accruals      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Reduction in deferred income tax assets     $ 9,000
Pro forma      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Effect of different tax rates on earnings of foreign subsidiaries   343,000  
Pro forma | Unrealised foreign exchange gains (losses)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income taxes (note 18)   $ 74,000