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Earnings Per Share - Summary of weighted average number of shares outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 19,928	$ 9,932
Denominator:
Weighted average common shares outstanding (in shares)	16,760	16,627
Weighted average dilutive securities (in shares)	285	115
Weighted average common shares outstanding, diluted (in shares)	17,045	16,742
Income per common share:
Basic (in dollars per share)	$ 1.19	$ 0.60
Diluted (in dollars per share)	$ 1.17	$ 0.59

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- 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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