Retirement Plans (Components of Net Periodic Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Net Periodic Benefit Cost [Abstract]
Service cost	$ 0	$ 1,932	$ 1,382
Interest cost	13,716	14,546	15,377
Expected return on plan assets	(18,455)	(16,875)	(16,426)
Net amortization and deferral	(6)	(6)	(5)
Recognized net actuarial loss	7,779	6,424	1,015
Net periodic expense	$ 3,034	$ 6,021	$ 1,343