Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic net income per common share calculation:
Net income available to common shareholders	$ 193,501	$ 141,329	$ 326,974	$ 266,641
Denominator - Weighted average common shares outstanding (in shares)	76,030,081	75,751,296	75,975,982	75,703,407
Basic net income per common share (in dollars per share)	$ 2.55	$ 1.87	$ 4.30	$ 3.52
Diluted net income per common share calculation:
Numerator - Net income available to common shareholders	$ 193,501	$ 141,329	$ 326,974	$ 266,641
Dilutive shares contingently issuable (in shares)	60,000	189,000	86,000	231,000
Weighted Average Number of Shares Outstanding, Diluted	76,090,321	75,940,500	76,061,883	75,934,025
Diluted net income per common share (in dollars per share)	$ 2.54	$ 1.86	$ 4.30	$ 3.51