Net Income Per Share - Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted-average shares:
Basic weighted-average common shares outstanding	35,753	36,024
Total weighted-average shares	35,869	36,119
Earnings per common share—Basic
Net income	$ 43,306	$ 28,954
Net income available to common shareholders—Basic	$ 43,166	$ 28,878
Net income per common share—Basic	$ 1.21	$ 0.80
Basic weighted-average common shares outstanding	35,753	36,024
Effect of diluted shares	1,996	2,006
Diluted weighted-average shares outstanding	37,749	38,030
Net income per common share—Diluted	$ 1.14	$ 0.76
RSAs
Weighted-average shares:
Basic weighted-average common shares outstanding	116	95
Earnings per common share—Basic
Less: Undistributed earnings allocated to RSAs	$ 140	$ 76
Basic weighted-average common shares outstanding	116	95
Common Stock
Weighted-average shares:
Basic weighted-average common shares outstanding	35,753	36,024
Earnings per common share—Basic
Basic weighted-average common shares outstanding	35,753	36,024