Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Basic
Net income available to common shareholders	$ 7,949	$ 21,040
Less: income attributable to unvested stock-based compensation awards	(99)	(349)
Net earnings allocated to common shareholders	$ 7,850	$ 20,691
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	14,904,067	15,313,635
Less: unvested stock-based compensation awards (in shares)	(185,119)	(253,460)
Weighted average shares outstanding - Basic (in shares)	14,718,948	15,060,175
Diluted
Net earnings allocated to common shareholders	$ 7,850	$ 20,691
Weighted average shares outstanding - Basic (in shares)	14,718,948	15,060,175
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares)	55,321	76,348
Weighted average shares outstanding - Diluted (in shares)	14,774,269	15,136,523
Basic EPS (in dollars per share)	$ 0.53	$ 1.37
Diluted EPS (in dollars per share)	$ 0.53	$ 1.37

This element represents the income allocated to unvested restricted stock awards.

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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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This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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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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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, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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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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