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 | |
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Jan. 02, 2012
|
Jan. 02, 2011
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Jun. 30, 2012
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Jun. 29, 2013
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Dec. 31, 2012
|
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Multi-employer defined benefit pension plan
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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 |