Net Income Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator for basic and diluted income per common share:
Net income	$ 18,248	$ 23,962	$ 45,658	$ 48,812
Less: Net income allocated to unvested participating restricted stock	(446)	(673)	(1,125)	(1,273)
Net income available to common stockholders - basic	17,802	23,289	44,533	47,539
Effect of unvested participating restricted stock in two-class calculation	0	1	0	1
Net income available to common stockholders - diluted	$ 17,802	$ 23,290	$ 44,533	$ 47,540
Denominator:
Weighted average outstanding shares of common stock - basic (in shares)	15,308	16,050	15,304	16,386
Dilutive effect of stock options	9	30	20	32
Weighted average outstanding shares of common stock - diluted (in shares)	15,317	16,080	15,324	16,418
Net income per common share:
Basic (USD per share)	$ 1.16	$ 1.45	$ 2.91	$ 2.90
Diluted (USD per share)	$ 1.16	$ 1.45	$ 2.91	$ 2.90