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Retirement Plans (Change in Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Retirement Plans [Abstract]
Benefit obligations at beginning of year	$ 7,800	$ 7,726
Interest cost	581us-gaap_DefinedBenefitPlanInterestCost	575us-gaap_DefinedBenefitPlanInterestCost	557us-gaap_DefinedBenefitPlanInterestCost
Benefit payments	(51)us-gaap_DefinedBenefitPlanBenefitsPaid	(51)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial loss (gain)	747	(450)
Benefit obligations at end of year	$ 9,077	$ 7,800	$ 7,726

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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