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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Borrowings) (Details) - USD ($)
Jul. 19, 2017
Jul. 01, 2017
Dec. 31, 2016
Jul. 02, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt   $ 661,846,000 $ 580,376,000 $ 580,678,000
Maximum borrowing capacity   500,000,000    
Secured revolving credit facility [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt   266,000,000 184,977,000 185,714,000
Maximum borrowing capacity   100,000,000    
Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt   400,000,000 $ 400,000,000 $ 400,000,000
Debt Instrument, face amount   400,000,000    
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt   $ 412,000,000    
Secured revolving credit facility [Member] | Subsequent Event [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 366,000,000      
Maximum borrowing capacity 100,000,000      
Outstanding borrowings $ 366,000,000