CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Stockholders' equity, beginning balance at Dec. 31, 2011	$ (381,704)	$ 633	$ 350,390	$ (672,847)	$ (59,880)
Common stock, beginning balance (shares) at Dec. 31, 2011		63,260,000
Other comprehensive income (loss):
Net loss	(79,887)			(79,887)
Other comprehensive (loss) income:
Changes in pension and other employee benefit accounts, net of taxes	(7,986)				(7,986)
Currency translation adjustment	665				665
Other comprehensive loss	(7,321)
Total comprehensive loss	(87,208)
Purchase and retirement of common stock upon vesting of RSUs (shares)		502,000
Purchase and retirement of common stock upon vesting of RSUs	(735)	(5)	(740)
Amortization of stock based compensation	5,333		5,333
Stockholders' equity, ending balance at Dec. 29, 2012	(464,314)	638	354,983	(752,734)	(67,201)
Common stock, ending balance (shares) at Dec. 29, 2012		63,762,000
Other comprehensive income (loss):
Net loss	(68,786)			(68,786)
Other comprehensive (loss) income:
Changes in pension and other employee benefit accounts, net of taxes	31,430				31,430
Currency translation adjustment	(4,529)				(4,529)
Other comprehensive loss	26,901
Total comprehensive loss	(41,885)
Issuance of stock (shares)		2,083,000
Issuance of stock	6,042	21	6,021
Exercise of stock options (shares)		20,000
Exercise of stock options	98	0	98
Purchase and retirement of common stock upon vesting of RSUs (shares)		400,000
Purchase and retirement of common stock upon vesting of RSUs	(660)	(4)	(664)
Amortization of stock based compensation	3,739		3,739
Stockholders' equity, ending balance at Dec. 28, 2013	(496,980)	663	364,177	(821,520)	(40,300)
Common stock, ending balance (shares) at Dec. 28, 2013	66,265,000	66,265,000
Other comprehensive income (loss):
Net loss	(83,863)			(83,863)
Other comprehensive (loss) income:
Changes in pension and other employee benefit accounts, net of taxes	(56,576)				(56,576)
Currency translation adjustment	(1,321)				(1,321)
Other comprehensive loss	(57,897)
Total comprehensive loss	(141,760)
Exchange of 7% Notes (shares)		1,068,000
Exchange of 7% Notes	4,187	11	4,176
Exercise of stock options (shares)		10,000
Exercise of stock options	20	0	20
Purchase and retirement of common stock upon vesting of RSUs (shares)		339,000
Purchase and retirement of common stock upon vesting of RSUs	(562)	(3)	(565)
Amortization of stock based compensation	2,420		2,420
Stockholders' equity, ending balance at Dec. 27, 2014	$ (632,675)	$ 677	$ 370,228	$ (905,383)	$ (98,197)
Common stock, ending balance (shares) at Dec. 27, 2014	67,682,000	67,682,000