CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 25, 2010	$ 2,143	$ 1,442,810	$ (348,653)	$ (23,637)	$ 5,933	$ 1,078,596
Balance (in shares) at Dec. 25, 2010	214,282
Comprehensive income (loss):
Net income (loss)	0	0	(411,417)	0	790	(410,627)
Other comprehensive income (loss), net of tax:
Net unrealized holding losses on available-for-sale securities, net of tax of $0	0	0	0	(1,867)	0	(1,867)
Gains (losses) associated with pension and other postretirement benefit obligations, net of tax of $0	0	0	0	12	0	12
Total other comprehensive loss, net of tax						(1,855)
Total comprehensive income (loss)						(412,482)
Share-based compensation plans:
Share-based compensation	0	418	0	0	0	418
Other activity	0	107	1,480	0	(4,197)	(2,610)
Balance at Sep. 25, 2011	2,143	1,443,335	(758,590)	(25,492)	2,526	663,922
Balance (in shares) at Sep. 25, 2011	214,282
Balance at Dec. 25, 2011	2,143	1,443,484	(843,945)	(46,070)	2,818	558,430
Balance (in shares) at Dec. 25, 2011	214,282
Comprehensive income (loss):
Net income (loss)	0	0	151,462	0	230	151,692
Other comprehensive income (loss), net of tax:
Net unrealized holding losses on available-for-sale securities, net of tax of $0	0	0	0	(12)	0	(12)
Gains (losses) associated with pension and other postretirement benefit obligations, net of tax of $0	0	0	0	(16,140)	0	(16,140)
Total other comprehensive loss, net of tax						(16,152)
Total comprehensive income (loss)						135,540
Issuance of common stock	444	197,837	0	0	0	198,281
Issuance of common stock (in shares)	44,444
Share-based compensation plans:
Common stock issued under compensation plans	3	0	0	0	0	3
Common stock issued under compensation plans (in shares)	273
Requisite service period recognition	0	462	0	0	0	462
Balance at Sep. 23, 2012	$ 2,590	$ 1,641,783	$ (692,483)	$ (62,222)	$ 3,048	$ 892,716
Balance (in shares) at Sep. 23, 2012	258,999