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Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:                
Net income used for calculating basic and diluted income per share $ 35,357 $ 240,783 $ 210,939 $ 415,049 $ 229,548 $ 210,545 $ 487,079 $ 855,142
Denominator:                
Weighted average number of common shares used in the calculation of basic income per share (in shares) 74,884     77,484     76,466 77,880
Dilutive effect of outstanding awards associated with stock-based compensation plans (in shares) 103     484     292 564
Shares used in the calculation of diluted income per share (in shares) 74,987     77,968     76,758 78,444
Basic income per share (in dollars per share) $ 0.47     $ 5.36     $ 6.37 $ 10.98
Diluted income per share (in dollars per share) $ 0.47     $ 5.32     $ 6.35 $ 10.90
Antidilutive securities excluded from computation of (loss) income per share (in shares) 700     100     300 100