Net Income (Loss) per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator for basic and diluted income per common share:
Net income	$ 20,948	$ 23,111	$ 69,760	$ 78,076
Less: Net income allocated to unvested participating restricted stock	(575)	(502)	(1,852)	(1,920)
Net income available to common stockholders	20,373	22,609	67,908	76,156
Effect of unvested participating restricted stock in two-class calculation	0	2	3	13
Net income available to common stockholders - diluted	$ 20,373	$ 22,611	$ 67,911	$ 76,169
Denominator:
Weighted average outstanding shares of common stock - basic (in shares)	15,377	16,911	16,049	16,752
Dilutive effect of stock options (in shares)	26	60	30	106
Weighted average outstanding shares of common stock - diluted (in shares)	15,403	16,971	16,079	16,858
Net income per common share:
Net income per common share - basic (USD per share)	$ 1.32	$ 1.34	$ 4.23	$ 4.55
Net income per common share - diluted (USD per share)	$ 1.32	$ 1.33	$ 4.22	$ 4.52