Earnings Per Share - Two-class method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share
Net Income	$ 17,659	$ 7,104	$ 34,496	$ 21,888
Dividends and undistributed earnings allocated to participating securities	315	154	600	514
Net income available to common shareholders	$ 17,344	$ 6,950	$ 33,896	$ 21,374
Weighted-average common shares outstanding for basic earnings per share	17,121	14,274	17,101	13,957
Dilutive effect of stock-based awards	332	352	334	360
Weighted-average common shares outstanding for diluted earnings per share	17,453	14,626	17,435	14,317
Earnings per common share:
Basic earnings per common share	$ 1.01	$ 0.49	$ 1.98	$ 1.53
Diluted earnings per common share	$ 0.99	$ 0.48	$ 1.94	$ 1.49

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

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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