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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic net income per common share calculation:        
Net income available to common shareholders $ 132,779 $ 106,847 $ 382,401 $ 197,647
Denominator - Weighted average common shares outstanding (in shares) 75,494,286 75,240,664 75,449,900 75,417,663
Basic net income per common share (in dollars per share) $ 1.76 $ 1.42 $ 5.07 $ 2.62
Diluted net income per common share calculation:        
Numerator – Net income available to common shareholders $ 132,779 $ 106,847 $ 382,401 $ 197,647
Denominator - Weighted average common shares outstanding (in shares) 75,494,000 75,241,000 75,450,000 75,418,000
Dilutive shares contingently issuable (in shares) 342,000 119,000 311,000 127,000
Weighted average diluted common shares outstanding (in shares) 75,836,142 75,360,033 75,760,618 75,544,677
Diluted net income per common share (in dollars per share) $ 1.75 $ 1.42 $ 5.05 $ 2.62