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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Jul. 01, 2018
Dec. 31, 2017
Fair Value Measurement [Line Items]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 71,868 $ 102,450 $ 81,990 $ 73,831
Restricted investments classified as held-to-maturity 148,154 155,641    
Deferred compensation mutual funds 28,416 23,363    
Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,084 76,690    
Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 69,081 75,432    
Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,944 2,531    
U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,045 988    
Total Fair Value        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 23,124 46,988    
Total Fair Value | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 48,744 55,462    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 71,868 102,450    
Restricted investments classified as held-to-maturity 148,154 155,641    
Deferred compensation mutual funds 28,416 23,363    
Total Fair Value | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,084 76,690    
Total Fair Value | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 69,081 75,432    
Total Fair Value | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,944 2,531    
Total Fair Value | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,045 988    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 23,124 46,988    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 48,744 55,462    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 71,868 102,450    
Restricted investments classified as held-to-maturity 0 0    
Deferred compensation mutual funds 28,416 23,363    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Significant Other Observable Inputs (Level 2)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 0 0    
Significant Other Observable Inputs (Level 2) | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0    
Restricted investments classified as held-to-maturity 148,154 155,641    
Deferred compensation mutual funds 0 0    
Significant Other Observable Inputs (Level 2) | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,084 76,690    
Significant Other Observable Inputs (Level 2) | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 69,081 75,432    
Significant Other Observable Inputs (Level 2) | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,944 2,531    
Significant Other Observable Inputs (Level 2) | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,045 988    
Significant Unobservable Inputs (Level 3)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 0 0    
Significant Unobservable Inputs (Level 3) | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0    
Restricted investments classified as held-to-maturity 0 0    
Deferred compensation mutual funds 0 0    
Significant Unobservable Inputs (Level 3) | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Significant Unobservable Inputs (Level 3) | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Significant Unobservable Inputs (Level 3) | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
Significant Unobservable Inputs (Level 3) | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity $ 0 $ 0