Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Cash Surrender Value of Life Insurance	$ 7,000		$ 6,900
Benefits Payable, Age	65
Benefits paid	$ 400
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	1,600
Service cost	0	$ 11
Interest cost	304	307
Net amortization	84	134
Net periodic pension cost	$ 388	$ 452