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Pension Plans (Details) (Multi-employer defined benefit pension plan, USD $)
In Thousands, unless otherwise specified
0 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2012
Jan. 02, 2011
Jun. 30, 2012
Jun. 29, 2013
Dec. 31, 2012
Multi-employer defined benefit pension plan
         
Pension Plans          
Percentage of funded status 66.90% 83.60%      
Percentage of funded status of current market value of investment 55.60% 70.00%      
Projection period beyond which plan is projected to emerge from critical status, under the Rehabilitant Plan         30 years
Percentage of compounded annual surcharge each year       5.00%  
Percentage of interim surcharge     5.00%    
Estimated liability upon withdrawal from plan in current year         $ 37,200