CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Comprehensive Income [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 27, 2009		$ (435,794)	$ (27,266)	$ 771	$ 648,583	$ 6,514	$ 192,808
Balance, (in shares) at Dec. 27, 2009				77,141
Comprehensive income (loss):
Net Income (loss)	87,141	87,141				3,185	90,326
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(226)		(226)				(226)
Recognition in earnings of previously unrealized gains on a derivative instrument designated as a cash flow hedge, net of tax	(2,565)		(2,565)				(2,565)
Gains (losses) associated with pension and other postretirement benefits, net of tax	6,420		6,420				6,420
Total other comprehensive income (loss)	3,629						3,629
Total comprehensive income (loss)	90,770						93,955
Common stock issued				1,372	798,628		800,000
Common stock issued (in shares)				137,141
Other activity					(4,401)	(3,766)	(8,167)
Balance at Dec. 26, 2010		(348,653)	(23,637)	2,143	1,442,810	5,933	1,078,596
Balance, (in shares) at Dec. 26, 2010				214,282
Comprehensive income (loss):
Net Income (loss)	(496,772)	(496,772)				1,082	(495,690)
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(1,160)		(1,160)				(1,160)
Gains (losses) associated with pension and other postretirement benefits, net of tax	(21,273)		(21,273)				(21,273)
Total other comprehensive income (loss)	(22,433)						(22,433)
Total comprehensive income (loss)	(519,205)						(518,123)
Share-based compensation					567		567
Other activity		1,480			107	(4,197)	(2,610)
Balance at Dec. 25, 2011		(843,945)	(46,070)	2,143	1,443,484	2,818	558,430
Balance, (in shares) at Dec. 25, 2011				214,282
Comprehensive income (loss):
Net Income (loss)	174,234	174,234				(192)	174,042
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(12)		(12)				(12)
Gains (losses) associated with pension and other postretirement benefits, net of tax	(22,429)		(22,429)				(22,429)
Total other comprehensive income (loss)	(22,441)						(22,441)
Total comprehensive income (loss)	151,793						151,601
Common stock issued				444	197,837		198,281
Common stock issued (in shares)				44,444
Share-based compensation plans:
Common stock issued under compensation plans				3			3
Common stock issued under compensation plans (in shares)				273
Requisite service period recognition					682		682
Balance at Dec. 30, 2012		$ (669,711)	$ (68,511)	$ 2,590	$ 1,642,003	$ 2,626	$ 908,997
Balance, (in shares) at Dec. 30, 2012				258,999