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Earnings Per Share (Schedule Of Reconciliation Of Shares Used To Compute Earnings Per Share) (Details) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Weighted average shares outstanding used to compute basic net income per share	11,623	13,467	12,016	13,542
Incremental shares issuable upon the assumed exercise of stock options		35	11	39
Unvested restricted stock	24	55	28	82
Shares used to compute diluted earnings per share	11,647	13,557	12,055	13,663

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Incremental Common Shares Attributable To Unvested Restricted Stock Arrangements

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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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