Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic earnings per share
Net income	$ 22,944	$ 22,628	$ 88,073	$ 48,417
Average common shares outstanding (in shares)	57,148	53,978	55,954	52,926
Net income per share (in dollars per share)	$ 0.40	$ 0.42	$ 1.57	$ 0.91
Diluted earnings per share
Average common shares outstanding (in shares)	57,148	53,978	55,954	52,926
Add: Dilutive effect of employee restricted stock and stock options (in shares)	497	323	487	399
Average diluted shares outstanding (in shares)	57,645	54,301	56,441	53,325
Net income per share (in dollars per share)	$ 0.40	$ 0.42	$ 1.56	$ 0.91