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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 30, 2018
Sep. 24, 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 $ 117,040   117,040      
Pension Benefits            
Change in projected benefit obligation:            
Projected benefit obligation, beginning of period     178,247 $ 167,159    
Interest cost 1,366 $ 1,392 4,097 4,178    
Actuarial losses (gains)     (9,787) 9,433    
Benefits paid     (6,857) (7,571)    
Projected benefit obligation, end of period 165,700 173,199 165,700 173,199    
Change in plan assets:            
Fair value of plan assets, beginning of period     112,570 97,526    
Actual return on plan assets     1,853 9,321    
Contributions by employer     9,474 10,538    
Benefits paid     (6,857) (7,571)    
Fair value of plan assets, end of period 117,040 109,814 117,040 109,814    
Funded status:            
Unfunded benefit obligation, end of period (48,660)   (48,660)   $ (65,677)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:            
Current liability (12,155)   (12,155)   (12,168)  
Long-term liability (36,505)   (36,505)   (53,509)  
Recognized liability (48,660)   (48,660)   (65,677)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:            
Net actuarial loss (gain) 46,241 49,847 46,241 49,847 54,235 $ 46,494
Other Benefits            
Change in projected benefit obligation:            
Projected benefit obligation, beginning of period     1,603 1,648    
Interest cost 12 13 35 38    
Actuarial losses (gains)     (67) 25    
Benefits paid     (111) (111)    
Projected benefit obligation, end of period 1,460 1,600 1,460 1,600    
Change in plan assets:            
Fair value of plan assets, beginning of period     0 0    
Actual return on plan assets     0 0    
Contributions by employer     111 111    
Benefits paid     (111) (111)    
Fair value of plan assets, end of period 0 0 0 0    
Funded status:            
Unfunded benefit obligation, end of period (1,460)   (1,460)   (1,603)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:            
Current liability (148)   (148)   (149)  
Long-term liability (1,312)   (1,312)   (1,454)  
Recognized liability (1,460)   (1,460)   (1,603)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:            
Net actuarial loss (gain) $ (32) $ (6) $ (32) $ (6) $ 35 $ (31)