Pension and Postretirement Benefit Plans Net Periodic Benefit (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 5,000,000
Defined Benefit Plan, Amortization of Gains (Losses)	100,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	96,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	873,000	844,000
Interest cost	2,458,000	1,391,000
Expected return on plan assets	(3,118,000)	(1,884,000)
Curtailment / settlement (gain) loss	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	(4,000)	88,000
Transition costs and other	0	0
Net periodic benefit cost	209,000	439,000
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	9,000	15,000
Interest cost	93,000	46,000
Curtailment / settlement (gain) loss	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	5,000	9,000
Transition costs and other	0	0
Net periodic benefit cost	107,000	70,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ (100,000)