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FAIR VALUE MEASUREMENTS (Schedule of Assets and Liabilities Measured on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Thousands
Jun. 25, 2017
Dec. 25, 2016
Commodity futures instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 3,855 $ 5,341
Derivative liabilities (8,717) (4,063)
Commodity options instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 9 98
Derivative liabilities (3,019) (2,764)
Foreign currency instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities (186)  
Level 1 | Commodity futures instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 3,855 5,341
Derivative liabilities (8,717) (4,063)
Level 1 | Commodity options instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 9 98
Derivative liabilities (3,019) $ (2,764)
Level 1 | Foreign currency instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities $ (186)