Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic net income per common share calculation:
Net income available to common shareholders	$ 128,805	$ 144,860	$ 455,779	$ 411,501
Denominator - Weighted average common shares outstanding (in shares)	76,044,182	75,761,930	75,998,965	75,723,129
Basic net income per common share (in dollars per share)	$ 1.69	$ 1.91	$ 6.00	$ 5.43
Diluted net income per common share calculation:
Numerator - Net income available to common shareholders	$ 128,805	$ 144,860	$ 455,779	$ 411,501
Dilutive shares contingently issuable (in shares)	158,000	217,000	104,000	222,000
Weighted Average Number of Shares Outstanding, Diluted	76,201,916	75,979,056	76,102,622	75,945,469
Diluted net income per common share (in dollars per share)	$ 1.69	$ 1.91	$ 5.99	$ 5.42