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Summary of Significant Accounting Policies (Earnings Per Share) (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
Accounting Policies [Abstract]        
Net income $ 115,661 $ 61,659 $ 341,527 $ 363,243
Shares used to compute basic earnings per common share (in shares) 132,231 135,203 133,035 136,524
Dilutive effect of stock options (in shares) 1,273 1,142 1,215 1,434
Shares used to compute diluted earnings per common share (in shares) 133,504 136,345 134,250 137,958
Basic earnings per common share (in USD per share) $ 0.87 $ 0.46 $ 2.57 $ 2.66
Diluted earnings per common share (in USD per share) $ 0.87 $ 0.45 $ 2.54 $ 2.63