Earnings per Share (Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income	$ 3,994	$ 3,508
Denominator for basic net income per common share:
Weighted average common shares outstanding (in shares)	12,282	12,169
Denominator for diluted net income per share:
Weighted average common shares outstanding (in shares)	12,282	12,169
Dilutive effect of stock options and restricted stock (in shares)	97	93
Diluted weighted average shares (in shares)	12,379	12,262
Earnings per common share:
Basic (in USD per share)	$ 0.33	$ 0.29
Diluted (in USD per share)	$ 0.32	$ 0.29

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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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.

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

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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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