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Net Income Per Common Share (Schedule of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Basic Net Income Per Common Share:        
Net income available to common shareholders $ 165,819 $ 169,761 $ 359,688 $ 332,507
Weighted average common shares outstanding (in shares) 146,113 145,328 145,957 145,301
Net income per common share, basic (in dollars per share) $ 1.13 $ 1.17 $ 2.46 $ 2.29
Diluted Net Income Per Common Share:        
Net income available to common shareholders $ 165,819 $ 169,761 $ 359,688 $ 332,507
Weighted average common shares outstanding (in shares) 146,113 145,328 145,957 145,301
Effect of dilutive outstanding equity-based awards (in shares) 437 987 687 1,188
Weighted average number of diluted common shares (in shares) 146,550 146,315 146,644 146,489
Net income per common share, diluted (in dollars per share) $ 1.13 $ 1.16 $ 2.45 $ 2.27