Earnings Per Share (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share
Denominator for Basic Earnings Per Share (in shares)	47,064,925	48,055,025	47,702,500
Dilutive Effect of Stock Options (in shares)	140,815	279,371	273,703
Dilutive Effect of Restricted Stock (in shares)	19,241	21,569	33,074
Denominator for Diluted Earnings Per Share (in shares)	47,224,981	48,355,965	48,009,277
Antidilutive stock options and restricted stock Outstanding (in shares)	554,062	224,372	401,308

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

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.

+ References

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+ Details