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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Advertising expense $ 8,100 $ 7,300 $ 7,800
Change in restricted cash   21,500 $ 19,800
Change in accounting standard cumulative-effect adjustment $ (1,525) 0  
Operating leases, maximum period afforded to each party to cancel lease agreements 90 days    
Building and Building Improvements      
Useful life 40 years    
Minimum      
Operating leases, renewal option period 3 years    
Minimum | Computers and software      
Useful life 3 years    
Minimum | Furniture and equipment      
Useful life 3 years    
Maximum [Member]      
Operating leases, renewal option period 5 years    
Maximum [Member] | Computers and software      
Useful life 10 years    
Maximum [Member] | Furniture and equipment      
Useful life 10 years    
Unrealized gain on investments, net of tax      
Change in accounting standard cumulative-effect adjustment $ (1,525) $ 0  
Accounting Standards Update 2016-02      
Operating Lease, Right-of-Use Asset 33,000    
Operating Lease, Liability $ 34,000