Earnings per Share - 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
Earnings Per Share [Abstract]
Net income	$ 13,166	$ 20,875	$ 33,483	$ 53,478
Net income allocated to unvested restricted stock awards	0	0	0	(30)
Net income allocated to common shares	$ 13,166	$ 20,875	$ 33,483	$ 53,448
Weighted average shares outstanding	29,490	29,390	29,516	29,359
Average unvested restricted stock awards	0	0	0	(16)
Denominator for basic earnings per share—weighted-average shares outstanding	29,490	29,390	29,516	29,343
Effect of dilutive securities—employee stock options and restricted stock units	110	140	153	136
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding	29,600	29,530	29,669	29,479
Basic (in dollars per share)	$ 0.45	$ 0.71	$ 1.14	$ 1.82
Diluted earnings per share	$ 0.45	$ 0.71	$ 1.13	$ 1.81
Average antidilutive options and restricted stock units excluded from computation of diluted earnings per share	400	283	253	287