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EMPLOYEE BENEFIT PLANS - Reconciliation of Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Change in fair value of plan assets:      
Employer contributions $ 4,000    
Pension Plans      
Change in projected benefit obligations:      
Benefit obligation at beginning of year 345,220 $ 359,130  
Service cost 2,453 4,293 $ 4,155
Interest cost 12,046 12,974 13,831
Benefit payments (13,383) (8,191)  
Curtailment (279) 0  
Settlements (5,499) 0  
Plan amendments 188 0  
Transfer in from acquisition 5,271 0  
Actuarial loss (gain) 71,006 (10,362)  
Administrative expenses paid (605) (411)  
Effect of foreign exchange (36,476) (12,213)  
Benefit obligation at end of year 379,942 345,220 359,130
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 275,480 281,290  
Actual return on plan assets 23,388 6,263  
Employer contributions 10,551 6,762  
Settlements (5,499) 0  
Transfer in from acquisition 508 0  
Administrative expenses paid (605) (411)  
Effect of foreign exchange (33,537) (10,233)  
Fair value of plan assets at end of year 256,903 275,480 $ 281,290
Net balance sheet liability 123,039 69,740  
Amounts recognized in balance sheet:      
Noncurrent assets 0 261  
Current liabilities 1,120 6,133  
Noncurrent liabilities $ 121,919 $ 63,868