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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		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Common Stock And Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 33,907	$ 23,259	$ 62,853	$ 44,617
Weighted average common shares outstanding - basic	24,193	24,574	24,134	24,537
Dilutive effect of in-the-money equity awards	648	444	423	460
Weighted average common shares outstanding - diluted	24,841	25,018	24,557	24,997
Earnings per common share from net earnings - basic	$ 1.40	$ 0.95	$ 2.60	$ 1.82
Earnings per common share from net earnings - diluted	$ 1.36	$ 0.93	$ 2.56	$ 1.78

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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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