Pension Expense (Details) (Pension [Member], USD $)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Pension [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	$ 2,225,000	$ 1,957,000
Expected return on plan assets	(3,100,000)	(2,558,000)
Recognized net actuarial losses	1,800,000	2,161,000
Total net pension expense	925,000	1,560,000
Expected future contributions in remainder of fiscal year	$ 15,300,000