XML 43 R32.htm IDEA: XBRL DOCUMENT v3.8.0.1
FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
Apr. 01, 2018
Dec. 31, 2017
Apr. 02, 2017
Jan. 01, 2017
Fair Value Measurement [Line Items]        
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents $ 79,054 $ 73,831 $ 80,439 $ 103,222
Deferred compensation mutual funds 24,093 22,428    
Restricted investments classified as held-to-maturity 164,446 172,238    
Total Fair Value        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 26,636 28,780    
Total Fair Value | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 52,418 45,051    
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents 79,054 73,831    
Deferred compensation mutual funds 24,093 22,428    
Restricted investments classified as held-to-maturity 164,446 172,238    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 26,636 28,780    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 52,418 45,051    
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents 79,054 73,831    
Deferred compensation mutual funds 24,093 22,428    
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    
Deferred compensation mutual funds 0 0    
Restricted investments classified as held-to-maturity 164,446 172,238    
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    
Deferred compensation mutual funds 0 0    
Restricted investments classified as held-to-maturity $ 0 $ 0