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OTHER NON-CURRENT LIABILITIES (Statutory severance and pre-notice obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Changes in net defined benefit liability (asset) [abstract]    
Obligation, beginning of fiscal year $ 14,579 $ 8,882
Service cost 12,424 10,953
Interest cost 6,171 5,839
Actuarial loss 64 5,239
Foreign exchange gain (389) (527)
Benefits paid (16,753) (15,807)
Obligation, end of fiscal year $ 16,096 $ 14,579