Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic and diluted earnings per share
Numerator for basic and diluted earnings per share-income available to common shareholders	$ 4,763	$ 4,516	$ 10,026	$ 8,378
Denominator for basic earnings per share-weighted-average shares outstanding	16,770	16,772	16,760	16,742
Effect of dilutive securities-employee stock options and awards	3		3
Denominator for diluted earnings per share-adjusted weighted-average shares outstanding	16,773	16,772	16,763	16,742
Basic earnings per share	$ 0.28	$ 0.27	$ 0.60	$ 0.50
Diluted earnings per share	$ 0.28	$ 0.27	$ 0.60	$ 0.50
Average anti-dilutive options and awards excluded from computation of diluted earnings per share	603	518	589	503

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 amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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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