Earnings Per Common Share - Computation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per common share:
Net income	$ 494,308	$ 496,049	$ 475,543
Weighted-average basic common shares	76,051	74,551	70,393
Basic earnings per common share (in dollars per share)	$ 6.50	$ 6.65	$ 6.76
Diluted earnings per common share:
Net income	$ 494,308	$ 496,049	$ 475,543
Weighted-average basic common shares	76,051	74,551	70,393
Effect of dilutive securities (in shares)	429	630	496
Weighted-average dilutive shares	76,480	75,181	70,889
Diluted earnings per common share (in dollars per share)	$ 6.46	$ 6.60	$ 6.71