Pension Expense (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Pension contributions			$ 4,102,000	$ 8,283,000
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions, Net Present Value			11,200,000
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	2,225,000	1,957,000	4,450,000	3,914,000
Expected return on plan assets	(3,100,000)	(2,558,000)	(6,200,000)	(5,116,000)
Recognized net actuarial losses	1,800,000	2,161,000	3,600,000	4,322,000
Total net pension expense	$ 925,000	$ 1,560,000	$ 1,850,000	$ 3,120,000