Common Stock And Earnings Per Share (Schedule Of Common Stock And Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 19,680	$ 16,537
Weighted average common shares outstanding during period - basic	12,648	13,919
Dilutive effect of in-the-money equity awards	437	476
Weighted average common shares outstanding during period - diluted	13,085	14,395
Earnings per common share from net earnings - basic	$ 1.56us-gaap_EarningsPerShareBasic	$ 1.19us-gaap_EarningsPerShareBasic
Earnings per common share from net earnings - diluted	$ 1.50us-gaap_EarningsPerShareDiluted	$ 1.15us-gaap_EarningsPerShareDiluted
Equity awards for the following shares were not included in the their effect would be anti-dilutive:	125	273

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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