Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Lum Sum Payments	$ 26,063
Components of net periodic benefit costs:
Service cost	0	$ 0	$ 0	$ 0
Interest cost	1,328	1,330	2,656	2,659
Expected return on plan assets	(1,538)	(1,790)	(3,076)	(3,580)
Amortization of net loss	443	417	885	834
Amortization of prior service cost	0	0	0	0
Net periodic benefit costs	233	(43)	465	(87)
Settlement charge	(12,211)	0	(12,211)	0
Net periodic benefit costs	$ 12,444	$ (43)	$ 12,676	$ (87)