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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Earnings Per Share Details [Abstract]
Net earnings available to common shareholders	$ 37,131	$ 36,552	$ 106,864	$ 111,904
Weighted average shares outstanding for basic earnings per share	60,570	60,430	60,369	60,474
Dilutive effect of stock options computed using the treasury stock method and the average market price	1,208	985	1,271	1,141
Weighted average shares outstanding for diluted earnings per share	61,778	61,415	61,640	61,615
Basic Net Earnings per Common Share	$ 0.61	$ 0.60	$ 1.77	$ 1.85
Diluted Net Earnings per Common Share	$ 0.60	$ 0.60	$ 1.73	$ 1.82
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount			945	1,161

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