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INTANGIBLE ASSETS AND GOODWILL (Goodwill) (Details) - Goodwill - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Changes in intangible assets and goodwill [abstract]    
Balance, beginning of fiscal year $ 202,108 $ 190,626
Goodwill acquired (note 5) 24,087 9,629
Other 376 1,853
Balance, end of fiscal year $ 226,571 $ 202,108