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Note 3 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 66,690 $ 79,132 $ 199,450 $ 229,401
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 78,235 79,216 78,759 78,878
Effect of dilutive securities– Employee and director stock options and restricted share awards (in shares) 2,358 2,668 2,408 2,729
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 80,593 81,884 81,167 81,607
Basic earnings per common share (in dollars per share) $ 0.85 $ 1 $ 2.53 $ 2.91
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.83 $ 0.97 $ 2.46 $ 2.81