Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic earnings per share
Net income	$ 31,410	$ 25,080	$ 65,129	$ 25,789
Average common shares outstanding (in shares)	55,421	52,985	55,347	52,394
Net income per share (in dollars per share)	$ 0.57	$ 0.47	$ 1.18	$ 0.49
Diluted earnings per share
Average common shares outstanding (in shares)	55,421	52,985	55,347	52,394
Add: Dilutive effect of employee restricted stock and stock options (in shares)	480	323	480	413
Average diluted shares outstanding (in shares)	55,901	53,308	55,827	52,807
Net income per share (in dollars per share)	$ 0.56	$ 0.47	$ 1.17	$ 0.49