Retirement Plans (Funded Status and Net Periodic Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Reconciliation of Benefit Obligation [Roll Forward]
Service cost	$ 0	$ 1,932	$ 1,382
Interest cost	13,716	14,546	15,377
Actuarial (gain) loss	7,779	6,424	1,015
Pension Plans, Defined Benefit [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	352,009	328,523
Service cost	0	1,932
Interest cost	12,932	13,657
Actuarial (gain) loss	(29,158)	23,733
Benefits paid	(16,632)	(15,836)
Prior service cost due to acquisition	0	0
Benefit obligation at end of year	319,151	352,009
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	19,603	19,538
Service cost	0	0
Interest cost	696	786
Actuarial (gain) loss	(381)	1,398
Benefits paid	(2,094)	(2,119)
Prior service cost due to acquisition	0	0
Benefit obligation at end of year	17,824	19,603
Other Postretirement Benefit Plans, Defined Benefit [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,479	2,551
Service cost	0	0
Interest cost	88	103
Actuarial (gain) loss	(418)	(24)
Benefits paid	(136)	(151)
Prior service cost due to acquisition	62	0
Benefit obligation at end of year	$ 2,075	$ 2,479