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Common Stock And Earnings Per Share (Schedule Of Common Stock And Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 23,769	$ 30,098	$ 68,386	$ 78,159
Weighted average common shares outstanding - basic	24,283	24,178	24,462	24,112
Dilutive effect of in-the-money equity awards	305	872	409	938
Weighted average common shares outstanding - diluted	24,588	25,050	24,871	25,050
Earnings per common share from net earnings - basic	$ 0.98	$ 1.24	$ 2.80	$ 3.24
Earnings per common share from net earnings - diluted	$ 0.97	$ 1.20	$ 2.75	$ 3.12
Equity awards for the following shares were not included in the computation of diluted EPS due to the fact that their effect would be anti-dilutive:	2,035	2,309	2,091	2,236

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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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