Pension Plan Contributions (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 27, 2013	Dec. 31, 2012
Qualified Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Contributions paid-to-date	$ 10,000	$ 10,000
Defined Benefit Plan, Expected Contributions	0
Supplemental Employee Retirement Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Contributions paid-to-date	2,158	1,550
SERP, Expected contributions	$ 133