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Earnings Per Share (Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Weighted average shares outstanding used to compute basic earnings per share	32,187	32,051	32,132	32,031
Incremental dilutive shares attributable to stock options and restricted stock	448	50	426	216
Shares used to compute diluted earnings per share	32,635	32,101	32,558	32,247

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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