Pension And Other Post Retirement Benefits Net Periodic Benefit Cost For Other Post Retirement Benefit Plan (Details) - Other Post Retirement Benefits - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 29, 2014	Jun. 30, 2015	Jun. 29, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 20	$ 100	$ 54	$ 236
Interest cost	132	519	242	1,099
Recognized actuarial loss (gain)	20	(19)	12	(19)
Net periodic benefit credit	$ 172	$ 600	$ 308	$ 1,316