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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic net income per common share calculation:        
Net income available to common shareholders $ 127,992 $ 62,444 $ 249,622 $ 90,800
Denominator - Weighted average common shares outstanding (in shares) 75,481,198 75,210,869 75,427,340 75,507,136
Basic net income per common share (in dollars per share) $ 1.70 $ 0.83 $ 3.31 $ 1.20
Diluted net income per common share calculation:        
Numerator – Net income available to common shareholders $ 127,992 $ 62,444 $ 249,622 $ 90,800
Denominator - Weighted average common shares outstanding (in shares) 75,481,000 75,211,000 75,427,000 75,507,000
Dilutive shares contingently issuable (in shares) 329,000 112,000 308,000 139,000
Weighted average diluted common shares outstanding (in shares) 75,809,974 75,323,259 75,735,763 75,645,768
Diluted net income per common share (in dollars per share) $ 1.69 $ 0.83 $ 3.30 $ 1.20