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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jan. 02, 2011
participant
Jan. 02, 2011
Active participants
participant
Jan. 02, 2011
Retired or separated from service and receiving benefits
participant
Jan. 02, 2011
Retired or separated from service and entitled to receive future benefits
participant
Jun. 30, 2012
Multi-employer defined benefit pension plan
Jan. 31, 2012
Multi-employer defined benefit pension plan
Jan. 31, 2011
Multi-employer defined benefit pension plan
Sep. 29, 2012
Multi-employer defined benefit pension plan
Dec. 31, 2011
Multi-employer defined benefit pension plan
Pension Plans                      
Percentage of funded status               65.80% 83.60%    
Percentage of funded status of current market value of investment                 70.00%    
Number of plan participants     116,708 32,449 54,470 29,789          
Percentage of plan participants       28.00% 47.00% 26.00%          
Percentage of plan surcharge             5.00%        
Additional percentage of plan surcharge                   5.00%  
Contributions $ 2,046 $ 1,923                  
Liability upon withdrawal from plan in previous year                     21,120
Estimated liability upon withdrawal from plan in current year                   $ 37,200