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Net Periodic Benefit Cost-Defined Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2015
Sep. 26, 2014
Sep. 25, 2015
Sep. 26, 2014
Pension Benefits-U.S. Plans: [Member]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 4,128 4,796 12,709 14,118
Expected return on plan assets (6,150) (6,180) (18,189) (18,114)
Amortization 1,665 1,298 5,464 3,894
Net periodic benefit (income) cost (357) (86) (16) (102)
Pension Benefits-Non U.S. Plans: [Member]        
Service cost 947 1,127 2,972 3,039
Interest cost 9,563 12,717 29,099 37,804
Expected return on plan assets (8,485) (10,937) (26,294) (32,580)
Amortization 907 456 3,486 1,579
Net periodic benefit (income) cost 2,932 3,363 9,263 9,842
Other Post-Retirement Benefits: [Member]        
Service cost 49 21 151 94
Interest cost 248 288 887 871
Amortization 144 110 511 330
Net periodic benefit (income) cost $ 441 $ 419 $ 1,549 $ 1,295