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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Name Accounting Standards Codification

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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Earnings Per Share (Schedule of Weighted Average Number of Shares for Calculating Diluted Earnings Per Share) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common and potential common shares outstanding for diluted earnings per share
Weighted average common shares outstanding	30,920	30,850	30,703
Common shares outstanding for diluted earnings per share	30,920	30,999	30,991
Stock Options [Member]
Common and potential common shares outstanding for diluted earnings per share
Potential common shares outstanding for diluted earnings per share			61
Unconverted Restricted Stock Units [Member]
Common and potential common shares outstanding for diluted earnings per share
Potential common shares outstanding for diluted earnings per share		149	226
Unvested or Unconverted Restricted Stock [Member]
Common and potential common shares outstanding for diluted earnings per share
Potential common shares outstanding for diluted earnings per share			1