Pension and Other Retirement Plans - Amounts of Net Periodic Benefit Cost for Other Post Retirement Plans Applicable to Continuing and Discontinued Operations (Details) - Other Postretirement Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 28, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (credit) cost	$ (60)	$ 476	$ 1,772
Continuing Operations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (credit) cost	(60)	476	605
Discontinued Operations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (credit) cost	$ 0	$ 0	$ 1,167