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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 210,191 $ 190,166
Less accumulated depreciation and amortization (150,028) (126,168)
Property and equipment, net 60,163 63,998
Buildings and land    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 37,672 35,514
Computers and software    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 149,835 130,317
Furniture and equipment    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 15,527 12,262
Construction in progress    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 7,157 $ 12,073