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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator for basic and diluted income per common share:
Net income	$ 23,962	$ 29,362	$ 48,812	$ 54,965
Less: Net income allocated to unvested participating restricted stock	(673)	(657)	(1,273)	(1,431)
Net income available to common stockholders	23,289	28,705	47,539	53,534
Effect of unvested participating restricted stock in two-class calculation	1	3	1	10
Net income available to common stockholders - diluted	$ 23,290	$ 28,708	$ 47,540	$ 53,544
Denominator:
Weighted average outstanding shares of common stock - basic (in shares)	16,050	16,886	16,386	16,673
Dilutive effect of stock options (in shares)	30	91	32	129
Weighted average outstanding shares of common stock - diluted (in shares)	16,080	16,977	16,418	16,802
Net income per common share:
Net income per common share - basic (USD per share)	$ 1.45	$ 1.70	$ 2.90	$ 3.21
Net income per common share - diluted (USD per share)	$ 1.45	$ 1.69	$ 2.90	$ 3.19