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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2018
Jun. 25, 2017
Jul. 01, 2018
Jun. 25, 2017
Dec. 31, 2017
Dec. 25, 2016
Change in plan assets:            
Fair value of plan assets, beginning of period     $ 112,570      
Fair value of plan assets, end of period $ 113,775   113,775      
Pension Benefits            
Change in projected benefit obligation:            
Projected benefit obligation, beginning of period     178,247 $ 167,159    
Interest cost 1,365 $ 1,393 2,731 2,786    
Actuarial losses (gains)     (9,465) 8,885    
Benefits paid     (4,473) (4,430)    
Projected benefit obligation, end of period 167,040 174,400 167,040 174,400    
Change in plan assets:            
Fair value of plan assets, beginning of period     112,570 97,526    
Actual return on plan assets     97 7,142    
Contributions by employer     5,581 4,502    
Benefits paid     (4,473) (4,430)    
Fair value of plan assets, end of period 113,775 104,740 113,775 104,740    
Funded status:            
Unfunded benefit obligation, end of period (53,265)   (53,265)   $ (65,677)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:            
Current liability (12,159)   (12,159)   (12,168)  
Long-term liability (41,106)   (41,106)   (53,509)  
Recognized liability (53,265)   (53,265)   (65,677)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:            
Net actuarial loss (gain) 47,104 50,398 47,104 50,398 54,235 $ 46,494
Other Benefits            
Change in projected benefit obligation:            
Projected benefit obligation, beginning of period     1,603 1,648    
Interest cost 11 12 23 25    
Actuarial losses (gains)     (62) 101    
Benefits paid     (74) (74)    
Projected benefit obligation, end of period 1,490 1,700 1,490 1,700    
Change in plan assets:            
Fair value of plan assets, beginning of period     0 0    
Actual return on plan assets     0 0    
Contributions by employer     74 74    
Benefits paid     (74) (74)    
Fair value of plan assets, end of period 0 0 0 0    
Funded status:            
Unfunded benefit obligation, end of period (1,490)   (1,490)   (1,603)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:            
Current liability (148)   (148)   (149)  
Long-term liability (1,342)   (1,342)   (1,454)  
Recognized liability (1,490)   (1,490)   (1,603)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:            
Net actuarial loss (gain) $ (27) $ 70 $ (27) $ 70 $ 35 $ (31)