Supplemental Stockholders' Equity Information - Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period	$ (531,739)
Other comprehensive (loss)/income before reclassifications, before tax	(2,189)
Amounts reclassified from accumulated other comprehensive loss, before tax	6,884
Income tax (benefit)/expense	1,897	(135)
Other comprehensive income, net of tax	2,798	398
Balance, end of period	(528,941)
Foreign Currency Translation Adjustments [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period	11,327
Other comprehensive (loss)/income before reclassifications, before tax	(2,477)
Amounts reclassified from accumulated other comprehensive loss, before tax	0
Income tax (benefit)/expense	(1,008)
Other comprehensive income, net of tax	(1,469)
Balance, end of period	9,858
Unrealized Loss on Available-For-Sale Security [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period	(431)
Other comprehensive (loss)/income before reclassifications, before tax	(1,374)
Amounts reclassified from accumulated other comprehensive loss, before tax	0
Income tax (benefit)/expense	(563)
Other comprehensive income, net of tax	(811)
Balance, end of period	(1,242)
Funded Status of Benefit Plans [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period	(542,635)
Other comprehensive (loss)/income before reclassifications, before tax	1,662
Amounts reclassified from accumulated other comprehensive loss, before tax	6,884
Income tax (benefit)/expense	3,468
Other comprehensive income, net of tax	5,078
Balance, end of period	$ (537,557)