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Employee Benefit Plans Benefit Plan Obligations Compared to Plan Assets (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
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Pension Plans |  |
Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |
Accumulated benefit obligation | $ 275,849 | $ 299,127
Fair value of plan assets | 253,225 | 267,026
Other Post-Retirement Benefit Plans |  |
Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |
Accumulated benefit obligation | 30,584 | 29,994
Fair value of plan assets | $ 0 | $ 0

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