Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Net earnings	$ 4,877	$ 2,565	$ 6,211	$ 3,859
Denominator:
Weighted-average common shares outstanding (shares)	29,396	25,541	29,075	25,370
Basic earnings (loss) per common share (usd per share)	$ 0.17	$ 0.10	$ 0.21	$ 0.15
Numerator:
Net earnings	$ 4,877	$ 2,565	$ 6,211	$ 3,859
Denominator:
Weighted-average common shares outstanding (shares)	29,396	25,541	29,075	25,370
Incremental shares from stock-based compensation plans (shares)	419	709	442	572
Denominator for diluted earnings (loss) per common share (shares)	29,815	26,250	29,517	25,942
Diluted earnings (loss) per common share (usd per share)	$ 0.16	$ 0.10	$ 0.21	$ 0.15

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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