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Net Income Per Share - Reconciliation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of basic earnings per share ("EPS") to diluted EPS        
Net income available to common stockholders $ 104,021 $ 88,243 $ 299,185 $ 276,389
Basic weighted-average shares outstanding 42,673 42,813 42,651 43,044
Dilutive effect of potential common stock equivalents — restricted stock units 209 103 242 129
Diluted weighted-average shares outstanding 42,882 42,916 42,893 43,173
Net income per common share:        
Basic $ 2.44 $ 2.06 $ 7.01 $ 6.42
Diluted $ 2.43 $ 2.06 $ 6.98 $ 6.40