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Pension and Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Sep. 28, 2014
Sep. 29, 2013
Pension [Member]
       
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 921 $ 1,549 $ 2,861 $ 4,559
Interest cost 4,953 4,849 15,064 14,447
Expected return on assets (5,469) (5,600) (16,587) (16,691)
Net amortization and deferrals 1,210 2,418 3,713 7,206
Curtailment/settlement losses 0 1,064 0 6,485
Net periodic benefit cost 1,615 4,280 5,051 16,006
Contributions to defined benefit pension plans     5,900  
Expected contributions during the remainder of fiscal year     1,000  
Postretirement [Member]
       
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 137 188 412 563
Interest cost 332 345 997 1,035
Expected return on assets 0 0 0 0
Net amortization and deferrals (114) (65) (341) (195)
Curtailment/settlement losses 0 0 0 0
Net periodic benefit cost $ 355 $ 468 $ 1,068 $ 1,403