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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic net income per common share calculation:    
Net income available to common shareholders $ 125,312 $ 121,630
Denominator - Weighted average common shares outstanding (in shares) 75,654,986 75,372,883
Basic net income per common share (in dollars per share) $ 1.66 $ 1.61
Diluted net income per common share calculation:    
Numerator - Net income available to common shareholders $ 125,312 $ 121,630
Dilutive shares contingently issuable (in shares) 275,000 284,000
Weighted Average Number of Shares Outstanding, Diluted 75,930,372 75,657,149
Diluted net income per common share (in dollars per share) $ 1.65 $ 1.61