Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 28, 2014
Net Income (Loss)	$ 14,246	$ (319,918)	$ 476,663
(Loss) Income from Discontinued Operations, net of taxes (Note 2)	(72,794)	(4,581)	44
Net Income (Loss) from Continuing Operations	87,040	(315,337)	476,619
Other Comprehensive Loss from Continuing Operations, net of taxes	(10,766)	(24,475)	(185,136)
Comprehensive Income (Loss)	3,480	(344,393)	291,527
Continuing Operations
Net Income (Loss) from Continuing Operations	87,040	(315,337)	476,619
Change in unrecognized benefit plan gains and losses arising during the period, net of taxes of $(4,717), $(5,176), and $(121,030), respectively	(7,316)	(8,032)	(187,720)
Adjustment for previously unrecognized benefit plan gains and losses included in net income, net of taxes of $(114), $(25) and $(71), respectively	(176)	(36)	(110)
Change in unrecognized benefit plan gains and losses, net of taxes	(7,492)	(8,068)	(187,830)
Changes in unrealized holding gain (loss) arising during the period, net of taxes of $604, $(2,133) and $3,512, respectively	936	(3,308)	5,447
Change in foreign currency translation adjustments, net of taxes of $(1,545), $(1,458), and $(1,525), respectively	(2,362)	(3,519)	(2,365)
Other Comprehensive Loss from Continuing Operations, net of taxes	(8,918)	(14,895)	(184,748)
Comprehensive Income (Loss)	78,122	(330,232)	291,871
Discontinued Operations
(Loss) Income from Discontinued Operations, net of taxes (Note 2)	(72,794)	(4,581)	44
Comprehensive Income (Loss)	$ (74,642)	$ (14,161)	$ (344)