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Employee Benefit Plans (Obligations and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Change in fair value of plan assets:      
Employer contributions $ 5,900    
Pension Plans      
Change in projected benefit obligations:      
Benefit obligation at beginning of year 326,884 $ 286,212  
Service cost 3,437 3,397 $ 3,368
Interest cost 11,912 12,822 11,273
Benefit payments (7,517) (9,002)  
Actuarial loss (gain) (11,783) 50,550  
Administrative expenses paid (411) (459)  
Effect of foreign exchange (12,213) (16,636)  
Benefit obligation at end of year 310,309 326,884 286,212
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 281,290 272,659  
Actual return on plan assets 6,263 25,630  
Employer contributions 6,088 6,874  
Premiums paid (411) (459)  
Effect of foreign exchange (10,233) (14,412)  
Fair value of plan assets at end of year 275,480 281,290 272,659
Net balance sheet liability 34,829 45,594  
Amounts recognized in balance sheet:      
Noncurrent assets 261 61  
Current liabilities 149 169  
Noncurrent liabilities 34,941 45,486  
Other Post-Retirement Benefit Plans      
Change in projected benefit obligations:      
Benefit obligation at beginning of year 32,246 29,498  
Service cost 856 758 643
Interest cost 1,062 1,009 708
Benefit payments (674) (722)  
Actuarial loss (gain) 1,421 1,703  
Administrative expenses paid 0 0  
Effect of foreign exchange 0 0  
Benefit obligation at end of year 34,911 32,246 29,498
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 674 722  
Premiums paid 0 0  
Effect of foreign exchange 0 0  
Fair value of plan assets at end of year 0 0 $ 0
Net balance sheet liability 34,911 32,246  
Amounts recognized in balance sheet:      
Noncurrent assets 0 0  
Current liabilities 5,984 744  
Noncurrent liabilities $ 28,927 $ 31,502