Employee Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 28, 2013	Jun. 28, 2013
Unfunded obligation of the Pension Plan	$ 28,087	$ 28,087
Remaining employer contributions not paid	2,077	2,077
Defined Benefit Contributions, unpaid contributions lien trigger amount		1,000
Unpaid pension plan trust contributions lien	1,410	1,410
Defined Benefit Plan, Other Costs		47
Amortization of deferred pension expense	182	364
Supplemental Executive Retirement Plan
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 485	$ 485