Earnings per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 20,317	$ 32,603
Net income allocated to unvested restricted stock awards	0	(37)
Net income allocated to common shares	$ 20,317	$ 32,566
Weighted average shares outstanding	29,542	29,329
Average unvested restricted stock awards	0	(32)
Denominator for basic earnings per share—weighted-average shares outstanding	29,542	29,297
Effect of dilutive securities—employee stock options and restricted stock units	196	135
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding	29,738	29,432
Basic earnings per share	$ 0.69	$ 1.11
Diluted earnings per share	$ 0.68	$ 1.11
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share	249	315