Net Income Per Share (Computation Of Weighted Average Shares Outstanding Basic And Diluted) (Details)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Net Income Per Share [Abstract]
Common shares	23,692,780	25,635,487
Vested restricted stock units	637,247	522,185
Basic number of weighted average shares outstanding	24,330,027	26,157,672
Dilutive effect of stock options	39,266	57,555
Dilutive effect of restricted stock and restricted stock units	56,834	68,574
Dilutive number of weighted average shares outstanding	24,426,127	26,283,801
Restricted stock outstanding excluded from calculation of diluted net income per share		9,558

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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+ Details

- Definition

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.

+ References+ Details

- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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+ Details

- Definition

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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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details