Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011
Earnings Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]
Net earnings (loss) (in dollars)	$ (2,579)	$ 17,196
Basic [Abstract]
Average shares outstanding (in shares)	129,569	137,645
Equivalent shares (basic) (in shares)	129,569	137,645
Net earnings per common share-basic (in dollars per share)	$ (0.02)	$ 0.12
Diluted [Abstract]
Average shares outstanding (in shares)	129,569	137,645
Effect of dilutive securities:
Options and other share-based awards (in shares)	0	3,308
Equivalent shares (diluted) (in shares)	129,569	140,953
Net earnings per common share-diluted (in dollars per share)	$ (0.02)	$ 0.12
Options to acquire shares totaling excluded as antidilutive	12,011	1,173
Shares that would have been included in the calculation of diluted shares had the Company not had a net loss during the period.	8,469
Shares that would have been included in the diluted earnings per share calculation had the Company not had a net loss during the period.	1,991