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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounting Policies [Abstract]        
Net income $ 111,276 $ 133,778 $ 301,584 $ 263,248
Shares used to compute basic earnings per common share (in shares) 136,435 142,074 137,185 142,638
Dilutive effect of stock options (in shares) 1,382 2,138 1,579 2,121
Shares used to compute diluted earnings per common share (in shares) 137,817 144,212 138,764 144,759
Basic earnings per common share (in USD per share) $ 0.82 $ 0.94 $ 2.20 $ 1.85
Diluted earnings per common share (in USD per share) $ 0.81 $ 0.93 $ 2.17 $ 1.82