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Pension and Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Curtailment/settlement losses     $ 6,485  
Pension [Member]
       
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 1,549 1,001 4,559 3,280
Interest cost 4,849 5,104 14,447 15,650
Expected return on assets (5,600) (5,377) (16,691) (16,280)
Net amortization and deferrals 2,418 1,788 7,206 5,457
Curtailment/settlement losses 1,064 673 6,485 673
Net periodic benefit cost 4,280 3,189 16,006 8,780
Contributions to defined benefit pension plans     4,500  
Expected contributions during the remainder of fiscal year     1,300  
Postretirement [Member]
       
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 188 183 563 551
Interest cost 345 440 1,035 1,320
Expected return on assets 0 0 0 0
Net amortization and deferrals (65) 20 (195) 60
Curtailment/settlement losses 0 0 0 0
Net periodic benefit cost $ 468 $ 643 $ 1,403 $ 1,931