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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 30, 2012
Multiemployer Plans, Pension [Member]
Jun. 28, 2014
Multiemployer Plans, Pension [Member]
Pension Plans        
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
Pension plans        
Pension expense $ 1,354 $ 1,208