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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accounting Policies [Abstract]        
Net income $ 118,851 $ 111,276 $ 225,866 $ 301,584
Shares used to compute basic earnings per common share (in shares) 132,854 136,435 133,437 137,185
Dilutive effect of stock options (in shares) 1,082 1,382 1,186 1,579
Shares used to compute diluted earnings per common share (in shares) 133,936 137,817 134,623 138,764
Basic earnings per common share (in USD per share) $ 0.89 $ 0.82 $ 1.69 $ 2.20
Diluted earnings per common share (in USD per share) $ 0.89 $ 0.81 $ 1.68 $ 2.17